Peter Hosemann

Profile Information
Name
Professor Peter Hosemann
Institution
University of California-Berkeley
Position
Professor,
Affiliation
University of California Berkeley, Lawrence Berkeley Nationa Laboratory
h-Index
44
ORCID
0000-0003-2281-2213
Biography

Peter Hosemann is professor in the Department for Nuclear Engineering at the University of California Berkeley and current department chair, head graduate adviser and UC Berkeley’s radiation safety chair. In 2017 Professor Hosemann was elected chair of the Nuclear Science User Facility user group an international network of institutions providing unique materials characterisation tools. Professor Hosemann received his PhD in Material Science from the Montanuniversität Leoben, Austria in 2008 while he conducted the research on lead bismuth eutectic corrosion, ion beam irradiations and microscale mechanical testing was carried out at Los Alamos National Laboratory. He continued his research at Los Alamos National Laboratory and joined the UC Berkeley faculty in 2010. Professor Hosemann has authored more than 160 per reviewed publications since 2008. In 2014 he won the best reviewer of the journal of nuclear materials award, the ANS literature award and in 2015 he won the TMS early career faculty fellow award and the AIME Robert Lansing Hardy award. While being dedicated to his research and teaching he also leads the UC Berkeley Bladesmithing team which won the title of “best example of a traditional blade” for UC Berkeley and is the lead faculty for the CalSol solar car racing team which won the American Solar challenge for Berkeley in 2017.


Professor Hosemann is also the current chair of the NSUF User Organisation


Expertise
Mechanical Properties, Nanoindentation
Publications:
"A novel in-situ, lift-out, three-point bend technique to quantify the mechanical properties of an ex-service neutron irradiated inconel X-750 component" Peter Hosemann, Cameron Howard, Colin Judge, David Poff, Stephen Parker, Malcolm Griffiths, Journal of Nuclear Materials Vol. 498 2018 149-158 Link
A first of its kind small scale mechanical testing technique involving micro-three-point bending was invented, developed, and implemented on reactor irradiated, active Inconel X-750 components removed from service after approximately 53 and 67 dpa. These tests were performed at ambient room temperature in-situ using a scanning electron microscope in order to obtain live recordings of sample deformation and loading curves. Sample and testing apparatus preparation required novel lift-out and fabrication processes. Materials from two irradiation temperature regimes, low temperature (120-280 °C) and high temperature (300 ± 15 °C) were examined. Manufacturing and finishing (grinding) of this component create differences between its edge and center, so micro-specimens from both areas were extracted in order to study these differences. According to three-point beam bending theory, a 0.2% offset yield stress parameter is introduced and calculated for all specimens. Differences in mechanical properties due to irradiation temperature and dose effects were observed. Material irradiated at the higher temperature exhibited yield strength increases of ~540 MPa after 53 dpa and ~1000 MPa after 67 dpa. There was little difference (=310 MPa) in yield strength between materials irradiated at the lower temperature at 53 dpa and 67 dpa compared with non-irradiated material. Differences in yield strengths between the edge and center of the component are retained after irradiation. The difference in yield strengths for the edge and center regions was ~740 MPa for non-irradiated material. After irradiation to a dose of 67 dpa these differences were ~570 MPa for the lower irradiation temperature and ~710 MPa for higher irradiation temperature. There were no indications of grain boundary failures via cracking except for material irradiated to 67 dpa at low temperature.
"An analytical method to extract irradiation hardening from nanoindentation hardness-depth curves" Anna Kareer, A. Prasitthipayong, David Krumwiede, D.M. Collins, Peter Hosemann, Steve Roberts, Journal of Nuclear Materials Vol. 498 2018 274-281 Link
"Atom probe characterisation of segregation driven Cu and Mn–Ni–Si co-precipitation in neutron irradiated T91 tempered-martensitic steel" Paul Bagot, Maria A Auger, Nathan Almirall, Peter Hosemann, G. Robert Odette, Michael Moody, DAvid ARmstrong, Materialia Vol. 14 2020 Link
The T91 grade and similar 9Cr tempered-martensitic steels (also known as ferritic-martensitic) are leading candidate structural alloys for fast fission nuclear and fusion power reactors. At low temperatures (300–400 °C) neutron irradiation hardens and embrittles these steels, therefore it is important to investigate the origin of this mode of life limiting property degradation. T91 steel specimens were separately neutron irradiated to 2.14 dpa at 327 °C and 8.82 dpa at 377 °C in the Idaho National Laboratory Advanced Test Reactor. Atom probe tomography was used to investigate the segregation driven formation of Mn–Ni–Si-rich (MNSPs) and Cu-rich (CRP) co-precipitates. The precipitates increase in size and, slightly, in volume fraction at the higher irradiation temperature and dose, while their corresponding compositions were very similar, falling near the Si(Mn,Ni) phase field in the Mn–Ni–Si projection of the Fe-based quaternary phase diagram. While the structure of the precipitates has not been characterised, this composition range is distinctly different than that of the typically cited G-phase. The precipitates are composed of CRP with MNSP appendages. Such features are often observed in neutron irradiated reactor pressure vessel (RPV) steels. However, the Si, Ni, Mn, P and Cu solutes concentrations are lower in the T91 than in typical RPV steels. Thus, in T91 precipitation primarily takes place in solute segregated regions of line and loop dislocations. These results are consistent with the model for radiation induced segregation driven precipitation of MNSPs proposed by Ke et al. Cr-rich alpha prime (α’) phase formation was not observed.
"Atom probe tomography analysis of high dose MA957 at selected irradiation temperatures" Nathan Bailey, Peter Hosemann, Erich Stergar, Mychailo Toloczko, Journal of Nuclear Materials Vol. 459 2015 225-234 Link
Oxide dispersion strengthened (ODS) alloys are meritable structural materials for nuclear reactor systems due to the exemplary resistance to radiation damage and high temperature creep. Summarized in this work are atom probe tomography (APT) investigations on a heat of MA957 that underwent irradiation in the form of in-reactor creep specimens in the Fast Flux Test Facility–Materials Open Test Assembly (FFTF–MOTA) for the Liquid Metal Fast Breeder Reactor (LMFBR) program. The oxide precipitates appear stable under irradiation at elevated temperature over extended periods of time. Nominally, the precipitate chemistry is unchanged by the accumulated dose; although, evidence suggests that ballistic dissolution and reformation processes are occurring at all irradiation temperatures. At 412 °C–109 dpa, chromium enrichments – consistent with the a' phase – appear between the oxide precipitates, indicating radiation induced segregation. Grain boundaries, enriched with several elements including nickel and titanium, are observed at all irradiation conditions. At 412 °C–109 dpa, the grain boundaries are also enriched in molecular titanium oxide (TiO).
"Ceramic composites: A review of toughening mechanisms and demonstration of micropillar compression for interface property extraction" Christian Deck, Peter Hosemann, Yutai Katoh, Yevhen Zayachuk, Joey Kabel, David Armstrong, Takaaki Koyanagi, Journal of Materials Research Vol. 33 2018 424-439 Link
Ceramic fiber–matrix composites (CFMCs) are exciting materials for engineering applications in extreme environments. By integrating ceramic fibers within a ceramic matrix, CFMCs allow an intrinsically brittle material to exhibit sufficient structural toughness for use in gas turbines and nuclear reactors. Chemical stability under high temperature and irradiation coupled with high specific strength make these materials unique and increasingly popular in extreme settings. This paper first offers a review of the importance and growing body of research on fiber–matrix interfaces as they relate to composite toughening mechanisms. Second, micropillar compression is explored experimentally as a high-fidelity method for extracting interface properties compared with traditional fiber push-out testing. Three significant interface properties that govern composite toughening were extracted. For a 50-nm-pyrolytic carbon interface, the following were observed: a fracture energy release rate of ~2.5 J/m2, an internal friction coefficient of 0.25 ± 0.04, and a debond shear strength of 266 ± 24 MPa. This research supports micromechanical evaluations as a unique bridge between theoretical physics models for microcrack propagation and empirically driven finite element models for bulk CFMCs.
"Direct comparison of nanoindentation and tensile test results on reactor-irradiated materials" David Krumwiede, Takuya Yamamoto, Tarik Saleh, Stuart Maloy, G. Robert Odette, Peter Hosemann, Journal of Nuclear Materials Vol. 504 2018 135-143 Link
"Ion irradiation effects on commercial PH 13-8 Mo maraging steel Corrax" Ce Zheng, Ryan Schoell, Peter Hosemann, Djamel Kaoumi, Journal of Nuclear Materials Vol. 514 2019 255-265 Link
"Mechanical characteristics of SiC coating layer in TRISO fuel particles" Thak Sang Byun, David Frazer, Peter Hosemann, John Hunn, Maria Okuniewski, Kurt Terrani, Gokul Vasudevamurthy, J. N. Matros, Brian Jolly, Journal of Nuclear Materials Vol. 442 2013 133-142 Link
Tristructural isotropic (TRISO) particles are considered as advanced fuel forms for a variety of fission platforms. While these fuel structures have been tested and deployed in reactors, the mechanical properties of these structures as a function of production parameters need to be investigated in order to ensure their reliability during service. Nanoindentation techniques, indentation crack testing, and half sphere crush testing were utilized in order to evaluate the integrity of the SiC coating layer that is meant to prevent fission product release in the coated particle fuel form. The results are complimented by scanning electron microscopy (SEM) of the grain structure that is subject to change as a function of processing parameters and can alter the mechanical properties such as hardness, elastic modulus, fracture toughness and fracture strength. Through utilization of these advanced techniques, subtle differences in mechanical properties that can be important for in-pile fuel performance can be distinguished and optimized in iteration with processing science of coated fuel particle production.
"Micro-mechanical evaluation of SiC-SiC composite interphase properties and debond mechanisms" Mehdi Balooch, Peter Hosemann, Cameron Howard, Yutai Katoh, Takaaki Koyanagi, Yong Yang, Joey Kabel, Kurt Terrani, Composites Part B: Engineering Vol. 131 2017 173-183 Link
SiC-SiC composites exhibit exceptional high temperature strength and oxidation properties making them an advantageous choice for accident tolerant nuclear fuel cladding. In the present work, small scale mechanical testing along with AFM and TEM analysis were employed to evaluate PyC interphase properties that play a key role in the overall mechanical behavior of the composite. The Mohr-Coulomb formulation allowed for the extraction of the internal friction coefficient and debonding shear strength as a function of the PyC layer thickness, an additional parameter. These results have led to re-evaluation of the Mohr-Coulomb failure criterion and adjustment via a new phenomenological equation.SiC-SiC composites exhibit exceptional high temperature strength and oxidation properties making them an advantageous choice for accident tolerant nuclear fuel cladding. In the present work, small scale mechanical testing along with AFM and TEM analysis were employed to evaluate PyC interphase properties that play a key role in the overall mechanical behavior of the composite. The Mohr-Coulomb formulation allowed for the extraction of the internal friction coefficient and debonding shear strength as a function of the PyC layer thickness, an additional parameter. These results have led to re-evaluation of the Mohr-Coulomb failure criterion and adjustment via a new phenomenological equation.
"Microstructural and nanomechanical characterization of in-situ He implanted and irradiated fcc materials" David Frazer, Peter Hosemann, Djamel Kaoumi, Ce Zheng, Microscopy & Microanalysis Vol. 23 (Suppl 1) 2017 756-757 Link
"Performance evaluation and post-irradiation examination of a novel LWR fuel composed of U0.17ZrH1.6 fuel pellets bonded to Zircaloy-2 cladding by lead bismuth eutectic" Mehdi Balooch, Edgar Buck, Andy Casella, Peter Hosemann, Donald Olander, Dave Senor, Kurt Terrani, Journal of Nuclear Materials Vol. 486 2017 391-401 Link
A novel light water reactor fuel has been designed and fabricated at the University of California, Berkeley; irradiated at the Massachusetts Institute of Technology Reactor; and examined within the Radiochemical Processing Laboratory at the Pacific Northwest National Laboratory. This fuel consists of U0.17ZrH1.6 fuel pellets core-drilled from TRIGA reactor fuel elements that are clad in Zircaloy-2 and bonded with lead-bismuth eutectic. The performance evaluation and post irradiation examination of this fuel are presented here.
"Role of low-level void swelling on plasticity and failure in a 33 dpa neutron-irradiated 304 stainless steel, International Journal of Plasticity " Frank Garner, Hi Vo, David Frazer, Aaron Kohnert, Sebastien Teysseyre, Saryu Fensin, Peter Hosemann, International Journal of Plasticity Vol. 164 2023 Link
"The crystal structure, orientation, relationships and interfaces of the nanoscale oxides in nanostructured ferritic alloys" Yuan Wu, Jim Criston, Stephan Kraemer, Nathan Bailey, G. Robert Odette, Peter Hosemann, Acta Materialia Vol. 111 2016 108-115 Link
"Twin boundary-accelerated ferritization of austenitic stainless steels in liquid lead–bismuth eutectic" David Frazer, Peter Hosemann, Konstantina Lambrinou, Erich Stergar, Scripta Materialia Vol. 118 2016 37-40 Link
Exposure of austenitic stainless steels to liquid lead-bismuth eutectic with low concentration of dissolved oxygen typically results in selective leaching of highly-soluble alloying elements and ferritization of the dissolution-affected zone. In this work, focused ion beam, transmission electron backscatter diffraction and scanning transmission electron microscopy were utilised to elucidate early-stage aspects of the dissolution corrosion process of cold-worked austenitic stainless steels exposed to static, oxygen-poor liquid lead-bismuth eutectic at 450C for 1000 hours. It was found that deformation-induced twin boundaries in the cold-worked steel bulk provide paths of accelerated penetration of the liquid metal into the steel bulk.
Presentations:
"Effect of Thermal And Irradiation-induced Long Range Ordering in Ni-Cr Model Alloys" Fei Teng, David Sprouster, Peter Hosemann, Li-Jen Yu, Emmanuelle Marquis, Julie Tucker, NuMat October 14-18, (2018)
"Irradiation-induced microstructure and mechanical property evolution in an Fe-9Cr ODS alloy" Corey Dolph, Peter Hosemann, 8th International Conference on Processing & Manufacturing of Advanced Materials (THERMEC) [unknown]
"Manufacturing of nanostructured ODS steel cladding tubes for advanced nuclear reactors using cold spray technology" Mia Lenling, Hwasung Yeom, Ben Maier, Greg Johnson, David Hoelzer, Peter Hosemann, Stuart Maloy, Kumar Sridharan, Jeffrey Graham, The Minerals, Metals and Materials Society (TMS) 2019 March 10-14, (2019)
"Micro-Cantilever Testing of Environmental Barrier Coatings on CVD SiC" Peter Hosemann, Yutai Katoh, ANS Annual Meeting 2018 June 18-22, (2018)
"On the Opportunities and Challanges for Using Test REactor and Charged Particle Irradiations to Help Predict Inaccessible In-service Neutron Irradiations Effects" Peter Hosemann, Peter Wells, Takuya Yamamoto, TMS 2014 February 16-20, (2014)
"Post Irradiation Examination of Fast Neutron Irradiated 14YWT Tubes at Nuclear Science User Facilities" Eda Aydogan, Peter Hosemann, David Krumwiede, Stuart Maloy, Tarik Saleh, 2017 ANS Annual Meeting [unknown]
"Program Review Presentation Entitled "Development of Low Temperature Spray Process for Manufacturing Fuel Cladding and Surface Modification of Reactor Components"" Mia Lenling, Kumar Sridharan, Hwasung Yeom, Peter Hosemann, David Hoelzer, Jeffrey Graham, Stuart Maloy, Advanced Methods for Manufacturing Program Review December 4-6, (2018)
"The Role of Ordering Phase Transformations in Micro-mechanics of Ni-Cr Alloys for Nuclear Applications" Fei Teng, Stephanie Pitts, Hi Vo, Peter Hosemann, Julie Tucker, TMS March 11-14, (2018)
NSUF Articles:
From the Users Group: Nominations Open for Users Group Executive Committee - Open positions include secretary/chair elect, committee members and student members The goal of the Users Group is to provide a formal and clear channel from the NSUF users to the NSUF program office as well as advocate for the experimental activities at NSUF, and the Executive Committee helps facilitate this. Wednesday, August 28, 2019 - Newsletter, Users Group
From the Users Group: Vote for Your New Executive Committee - Election closes 10/31 The goal of the Users Group is to provide a formal and clear channel from the NSUF users to the NSUF program office as well as advocate for the experimental activities at NSUF, and the Executive Committee helps facilitate this. Wednesday, October 9, 2019 - Users Group, Newsletter
Users Organization Meeting Presentations Now Available - Wednesday, March 25, 2020 - Newsletter, Users Group
2020 NSUF Annual Review - Presentations The 2020 NSUF Annual Review presentations are now available online Tuesday, December 15, 2020 - DOE, Annual Review, Presentations
NSUF awards 24 Rapid Turnaround Experiment proposals - Approximately $1.42M has been awarded. Wednesday, February 8, 2023 - Calls and Awards
Additional Publications:
"Corrosion sensitivity of nickel-based Alloy Inconel 600 in pressurized water reactor water chemistry: Can KOH replace LiOH?" Minsung Hong, Chuanzhen Zhou, Kayla H. Yano, Daniel K. Schreiber, Peter Hosemann, Djamel Kaoumi, Fu-Yun Tsai, [2025] Corrosion Science · DOI: 10.1016/j.corsci.2025.113052
"Influence of helium ion irradiation on the mechanical properties of high-entropy (Hf,Ta,Ti,V,Zr)-nitride, -carbide and -diboride thin films: A comparative study" P. Hosemann, M. Balooch, A.N. Lee, M.L. Crespillo, K. Hattar, M.O. Liedke, A. Wagner, P. Polcik, A. Kirnbauer, P.H. Mayrhofer, T. Astecker, [2025] Materials & Design · DOI: 10.1016/j.matdes.2025.114223
"Bi‐Continuous W‐Rich Refractory High Entropy Alloy‐Cu Composite: Toward Material Innovation of Nuclear Reactor Coolant System" Il Hwan Kim, Ji Young Kim, Peter Hosemann, Eun Soo Park, Kook Noh Yoon, [2025] Small Methods · DOI: 10.1002/smtd.202500667
Abstract

Refractory high‐entropy alloys (RHEAs) are considered promising candidate materials for next‐generation nuclear reactors due to their superior mechanical strength, irradiation resistance, and thermal stability at high temperatures. However, the significant positive heat of mixing between refractory alloying elements and Cu, commonly used in cooling systems, poses challenges in forming composite structures. This study addresses the issue using a liquid metal dealloying (LMD) process. A precursor alloy (WTaVTi) with a directional dendrite‐interdendrite structure is fabricated and reacted with molten Cu at 1200 °C for 96 h. This approach produced a RHEA‐Cu composite with a stable interface between RHEA (W31.5Ta30.9V21.4Ti14.3) and Cu, featuring a spontaneously formed W‐rich interlayer that enhances interfacial bonding. The composite showed excellent irradiation resistance, with 30% less swelling under α‐ion irradiation than pure W. It also exhibited low thermal conductivity at room temperature, but reached ≈120 W m−1·K−1 at ≈650 °C, surpassing pure W. This temperature‐dependent rise in κ, with a positive gradient of +0.075 W m−1·K2, is attributed to decreasing diffuse mismatch at elevated temperatures. The large‐scale reaction and stable microstructure achieved through LMD process highlight its industrial potential. This work offers a strategy for developing high‐performance materials by combining RHEA's radiation resistance with Cu's thermal conductivity for extreme environments.

"Experimental Evaluation of Interfacial Bonding Strength Between 304 Stainless Steel Substrate and Electrodeposited Nickel Coating Using Mesoscale Mechanical Testing Methods" Sebastian Lam, M. J. K. Lodhi, Benjamin W. Spencer, Fei Teng, Peter Hosemann, Yuxin Hu, [2025] JOM · DOI: 10.1007/s11837-025-07288-0
"Micromechanical and microstructural effects of high dose helium implantation in single crystal vanadium" A. Scott, P. Hosemann, C. Gammer, C. Peddeti, [2025] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2025.155664
"Effect of cold forging on the microstructure and corrosion behavior of type 316L stainless steel in molten FLiNaK salt" Ryan D. Hayes, Ho Lun Chan, Haley Williams, Digby D. Macdonald, Raluca O. Scarlat, Djamel Kaoumi, John R. Scully, Peter Hosemann, Jie Qiu, [2025] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2025.155624
"Direct determination of diffusion flux in alloys via spatial separation of flux" Yujun Xie, Sungwoo Sohn, Michael Aderibigbe, Naijia Liu, Guannan Liu, Peter Hosemann, Jan Schroers, Arindam Raj, [2025] Acta Materialia · DOI: 10.1016/j.actamat.2024.120615
"Effect of thermal oxidation on helium implanted pure iron" Matthew deJong, Mehdi Balooch, Djamel Kaoumi, Peter Hosemann, Minsung Hong, [2025] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2024.155377
"Enhanced stress relaxation behavior via basal 〈a〉 dislocation activity in Zircaloy-4 cladding" Shmuel Samuha, Boopathy Kombaiah, David Kamerman, Peter Hosemann, Malachi Nelson, [2024] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2024.155337
"Effect of cryogenic milling on the mechanical and corrosion properties of ODS Hastelloy-N" Jeffrey E. Bickel, Ertugrul Demir, D. Kaoumi, Peter Hosemann, Minsung Hong, [2024] Materialia · DOI: 10.1016/j.mtla.2024.102215
"Corrosion mechanism of cold forged 316 stainless steel in molten FLiNaK salt" Shmuel Samuha, Peter Hosemann, Minsung Hong, [2024] Corrosion Science · DOI: 10.1016/j.corsci.2024.111990
"Directly resolving surface vs. lattice self-diffusion in iron at the nanoscale using in situ atom probe capabilities" Aaron A. Kohnert, Sten V. Lambeets, Kayla H. Yano, Evan K. Still, Pauline G. Simonnin, Peter Hosemann, Blas P. Uberuaga, Tiffany C. Kaspar, Daniel K. Schreiber, Sandra D. Taylor, [2024] Materialia · DOI: 10.1016/j.mtla.2024.102078
"Fabrication of bulk delta-phase Zirconium Hydride from Zircaloy-4 for use as moderators in microreactors" M.A. Tunes, T.J. Nizolek, T.A. Saleh, P. Hosemann, C.A. Kohnert, D. Parkison, [2024] Scripta Materialia · DOI: 10.1016/j.scriptamat.2023.115771
"A free-standing lithium phosphorus oxynitride thin film electrolyte promotes uniformly dense lithium metal deposition with no external pressure" Thomas Wynn, Bingyu Lu, Maxwell Marple, Bing Han, Ryosuke Shimizu, Bhagath Sreenarayanan, Jeffery Bickel, Peter Hosemann, Yangyuchen Yang, Han Nguyen, Weikang Li, Guomin Zhu, Minghao Zhang, Ying Shirley Meng, Diyi Cheng, [2023] Nature Nanotechnology · DOI: 10.1038/s41565-023-01478-0
"Corrosion property of Alloy 625 in Molten FLiNaK salt according to the Tellurium Concentrations" Ho Lun Chan, John R. Scully, Peter Hosemann, Minsung Hong, [2023] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2023.154548
"In situ measurements of non-equilibrium positron state defects during He irradiation in Si" M. O. Liedke, M. Butterling, B. P. Uberuaga, F. A. Selim, A. Wagner, P. Hosemann, R. Auguste, [2023] Journal of Applied Physics · DOI: 10.1063/5.0144308

Radiation-induced property changes in materials originate from the energy transfer from an incoming particle to the existing lattice, displacing atoms. The displaced atoms can cause the formation of extended defects including dislocation loops, voids, or precipitates. The non-equilibrium defects created during damage events determine the extent of these larger defects and are a function of dose rate, material, and temperature. However, these defects are transient and can only be probed indirectly. This work presents direct experimental measurements and evidence of irradiated non-equilibrium vacancy formation, where in situ positron annihilation spectroscopy was used to prove the generation of non-equilibrium defects in silicon.

"Dielectric barrier discharge plasma for catalytic-free palm oil hydrogenation using glycerol as hydrogen donor for further production of hydrogenated fatty acid methyl ester (H-FAME)" Doonyapong Wongsawaeng, Peter Hosemann, Kanokwan Ngaosuwan, Worapon Kiatkittipong, Suttichai Assabumrungrat, Grittima Kongprawes, [2023] Journal of Cleaner Production · DOI: 10.1016/j.jclepro.2023.136724
"Dose and dose rate effects on the microstructural and mechanical stability of long-range ordered precipitates in Inconel 718" S. Pal, N. Almirall, S. Tumey, G.R. Odette, S.A. Maloy, P. Hosemann, H.T. Vo, [2023] Materials Science and Engineering: A · DOI: 10.1016/j.msea.2023.144916
"Effect of tellurium concentration on the corrosion and mechanical properties of 304 stainless steel in molten FLiNaK salt" Ho Lun Chan, Yujun Xie, Elena Romanovskaia, John R. Scully, Peter Hosemann, Minsung Hong, [2023] Corrosion Science · DOI: 10.1016/j.corsci.2022.110913
"Mechanical performance and microstructure of the grade 91 stainless steel produced via Directed Energy deposition laser technique" J. Bickel, T. Mukherjee, T. DebRoy, T.J. Lienert, S.A. Maloy, C.R. Lear, P. Hosemann, S. Samuha, [2023] Materials & Design · DOI: 10.1016/j.matdes.2023.111804
"The effect of sample thickness on micro-mesoscale tensile properties of 304SS, HT-9, and CuCrZr" H. Vo, E. Olivas, J. Bickel, C. Hardie, P. Hosemann, S. Maloy, A. Dong, [2023] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2022.154207
"Corrosion behavior of a series of combinatorial physical vapor deposition coatings on SiC in a simulated boiling water reactor environment" Joey Kabel, Sebastian Lam, Amit Sharma, Johann Michler, Peter Hosemann, Djamel Kaoumi, Ryan Schoell, [2022] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2022.154022
"Effect of thermal oxidation on helium implanted 316L stainless steel" Angelica Lopez Morales, Ho Lun Chan, Digby D. Macdonald, Mehdi Balooch, Yujun Xie, Elena Romanovskaia, John R. Scully, Djamel Kaoumi, Peter Hosemann, Minsung Hong, [2022] Journal of Applied Physics · DOI: 10.1063/5.0122487

The effect of thermal oxide layer on He implanted 316L stainless steel was studied to evaluate experimentally how thermal oxidation affects the diffusion and distribution of He in the material. In the case of thermal oxidation of a He implanted sample, with an increase in oxidation time, the max swelling height increases logarithmically as a function of time and finally saturates for all samples except for the lowest dose of implanted He. Concerning TEM results, two void regions are identified. Similar to the calculation, the total irradiated depth was around 250 nm and the large void region was formed around 100–150 nm depth. On the other hand, the small void region was observed immediately under oxide layer from the thermal oxidation. In contrast, there were no voids in the altered zone near the metal/oxide interface in the non-thermal oxidized/He implanted sample. This description of the phenomena was justified using the Kirkendall effect and the Point Defect Model.

"Design considerations for high entropy alloys in advanced nuclear applications" Patrick A. Burr, Edward Obbard, Jamie J. Kruzic, Peter Hosemann, Bernd Gludovatz, Michael Moschetti, [2022] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2022.153814
"Helium implantation in Si (100): Swelling, microstructure, and mechanical property changes" Yujun Xie, Mehdi Balooch, Sean Lubner, Peter Hosemann, Xi Huang, [2022] Journal of Applied Physics · DOI: 10.1063/5.0096802

Microstructural changes induced by helium implantation in materials lead to volumetric swelling and mechanical property changes. How these properties are linked and establishing direct relationships can be difficult due to the underlying material’s microstructure evolution. Some materials also experience a phase change due to irradiation damage making them even more complex to analyze. Here, single crystalline Si (100) was used to establish a relationship among these parameters. The swelling height as a function of implantation fluence can equally fit a linear relationship. Solely irradiation induced defects are observed at low fluence below 5.0 × 1016 ions/cm2. An abrupt amorphous and crystalline mixed layer of ∼200 nm thick within a highly damaged polycrystalline matrix is observed when implantation fluence exceeds 5.0 × 1016 ions/cm2, leading to the appearance of irradiation induced swelling and hardening behavior. As the fluence increases beyond 1.0 × 1017 ions/cm2, the amorphous layer expands in size and the bubble size distribution takes the form of a Gaussian distribution with a maximum size of up to 6.4 nm, which causes a further increase in the height of swelling. Furthermore, irradiation induced softening appeared due to the enlarged bubble size and amorphization.

"Corrosion Testing of Additively Manufactured FeCrAl Alloy in LBE" Shuang Bai, J. Bickel, J. Qiu, P. Hosemann, [2021] JOM · DOI: 10.1007/s11837-021-04947-w
"Defect Characterization Using Positron Annihilation Spectroscopy on Laser-Ablated Surfaces" R. Auguste, S. Lam, M. Butterling, M. O. Liedke, A. G. Attallah, E. Hirschmann, A. Wagner, C. P. Grigoropoulos, F. Selim, B. P. Uberuaga, P. Hosemann, [2021] JOM · DOI: 10.1007/s11837-021-04965-8
"Femtosecond Laser Machining of Micromechanical Tensile Test Specimens" J. Duckering, J. Peterson, S. Lam, D. Routledge, P. Hosemann, A. Dong, [2021] JOM · DOI: 10.1007/s11837-021-04971-w
"Iron-rich microstructure records of high temperature multi-component silicate melt behavior in nuclear fallout" Kim Knight, Zurong R. Dai, Enrica Balboni, Bethany L. Goldblum, Peter Hosemann, Tim Genda, [2021] Journal of Environmental Radioactivity · DOI: 10.1016/j.jenvrad.2021.106700
"Deformation twinning versus slip in Ni-based alloys, containing Pt2Mo-structured, Ni2Cr-typed precipitates" K. Dang, F. Teng, M. Schneider, B.P. Eftink, S.A. Maloy, J.D. Tucker, L. Capolungo, P. Hosemann, H.T. Vo, [2021] Materials & Design · DOI: 10.1016/j.matdes.2021.109820
"Direct observation of the elasticity-texture relationship in pyrolytic carbon via in situ micropillar compression and digital image correlation" Thomas E.J. Edwards, Amit Sharma, Johann Michler, Peter Hosemann, Joey Kabel, [2021] Carbon · DOI: 10.1016/j.carbon.2021.06.045
"Effects of radiation damage and precipitate distribution on micro-pillar compression testing of irradiated CuCrZr" H.T. Vo, J.J.H. Lim, A.J. Bushby, P. Hosemann, C.D. Hardie, Alexandra J. Cackett, [2021] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2021.153028
"Neutron irradiation induced defects in oxides and their impact on the oxide properties" C. B. Somodi, P. Stepanov, D. E. Wall, L. A. Boatner, P. Hosemann, Y. Q. Wang, B. P. Uberuaga, F. A. Selim, M. Haseman, [2021] Journal of Applied Physics · DOI: 10.1063/5.0046292

Understanding the irradiation-induced defects in oxides is of interest for a wide range of applications. ZnO is an interesting oxide with mixed ionic and covalent bonding that contains a variety of point defect structures—making it an excellent model for studying irradiation-induced defects and their impact on properties. Here, we investigate the effects of neutron irradiation on the formation of defects and on the structural, optical, and electrical properties of ZnO single crystals. We observe the formation of vacancies and voids via positron annihilation spectroscopy. Neutron irradiation led to a significant deterioration of the ZnO structure and formed a high concentration of point defects, vacancy clusters, and voids with large disparities in their structure across variable irradiation times. It also led to significant changes in the optical properties and sample color. Irradiation for 444 h induced a high concentration of Cu acceptors as well as a high concentration of Ga donors. Temperature-dependent Hall effect measurements revealed the competing production of donors and acceptors and showed an increase in the slope of the carrier freeze-out curve with increasing irradiation dose. This work demonstrates the combined effects of neutron irradiation in producing a wide range of structural defects, impurities, and dopants in oxides and their enormous impact on modifying the oxide structure and both the optical and electronic properties. It particularly emphasizes the importance of considering the production of new impurities and dopants during the neutron irradiation of oxides.

"Continuous biodiesel production based on hand blender technology for sustainable household utilization" Wijittra Wongjaikham, Doonyapong Wongsawaeng, Kanokwan Ngaosuwan, Worapon Kiatkittipong, Peter Hosemann, Suttichai Assabumrungrat, Manita Kamjam, [2021] Journal of Cleaner Production · DOI: 10.1016/j.jclepro.2021.126737
"Spatial and temporal variation of hardness of a printed steel part" T. DebRoy, T.J. Lienert, S.A. Maloy, P. Hosemann, T. Mukherjee, [2021] Acta Materialia · DOI: 10.1016/j.actamat.2021.116775
"Cryogenic in-situ clamped beam testing of Sn96" J. Kacher, A. A. Shapiro, P. Hosemann, A. M. Minor, A. Lupinacci, [2021] Journal of Materials Research · DOI: 10.1557/s43578-021-00157-x
"Atom probe characterisation of segregation driven Cu and Mn–Ni–Si co-precipitation in neutron irradiated T91 tempered-martensitic steel" M.  A. Auger, N. Almirall, P. Hosemann, G.  R. Odette, P.  A.  J. Bagot, M.  P. Moody, D.  E.  J. Armstrong, T.  P. Davis, [2020] Materialia · DOI: 10.1016/j.mtla.2020.100946
"Advanced Characterization and Testing of Irradiated Materials" Fan Zhang, Peter Hosemann, Dhriti Bhattacharyya, [2020] JOM · DOI: 10.1007/s11837-019-03924-8 · EID: 2-s2.0-85076581854
"Advanced Postirradiation Characterization of Nuclear Fuels Using Pulsed Neutrons" Mark A. M. Bourke, Aaron E. Craft, Jason M. Harp, Charles T. Kelsey, Jay Lin, Alex M. Long, Adrian S. Losko, Peter Hosemann, Kenneth J. McClellan, Markus Roth, Anton S. Tremsin, Sven C. Vogel, [2020] JOM · DOI: 10.1007/s11837-019-03849-2 · EID: 2-s2.0-85075181869
"Advances in additive manufacturing of metal-based functionally graded materials" Andrew A. Shapiro, Richard Otis, R. Peter Dillon, John Paul Borgonia, Bryan W. McEnerney, Peter Hosemann, Allison M. Beese, Ashley Reichardt, [2020] International Materials Reviews · DOI: 10.1080/09506608.2019.1709354 · EID: 2-s2.0-85077845464
"An Electrochemical Impedance Spectroscopic Study of Oxide Films in Liquid Metal" Digby D. Macdonald, Nan Li, Ryan Schoell, Djamel Kaoumi, Peter Hosemann, Jie Qiu, [2020] JOM · DOI: 10.1007/s11837-020-04120-9 · EID: 2-s2.0-85082664384
"Analysis of formation and growth of the σ phase in additively manufactured functionally graded materials" Brandon Bocklund, Ashley Reichardt, Richard Otis, John Paul Borgonia, Robert Peter Dillon, Andrew A. Shapiro, Bryan W. McEnerney, Peter Hosemann, Zi-Kui Liu, Allison M. Beese, Lourdes D. Bobbio, [2020] Journal of Alloys and Compounds · DOI: 10.1016/j.jallcom.2019.151729 · EID: 2-s2.0-85072336618
"Chemical manipulation of hydrogen induced high p-type and n-type conductivity in Ga2O3" Maciej Oskar Liedke, David Winarski, Maik Butterling, Andreas Wagner, Peter Hosemann, Yongqiang Wang, Blas Uberuaga, Farida A. Selim, Md Minhazul Islam, [2020] Scientific Reports · DOI: 10.1038/s41598-020-62948-2 · EID: 2-s2.0-85083168687
Abstract

Advancement of optoelectronic and high-power devices is tied to the development of wide band gap materials with excellent transport properties. However, bipolar doping (n-type and p-type doping) and realizing high carrier density while maintaining good mobility have been big challenges in wide band gap materials. Here P-type and n-type conductivity was introduced in β-Ga2O3, an ultra-wide band gap oxide, by controlling hydrogen incorporation in the lattice without further doping. Hydrogen induced a 9-order of magnitude increase of n-type conductivity with donor ionization energy of 20 meV and resistivity of 10−4 Ω.cm. The conductivity was switched to p-type with acceptor ionization energy of 42 meV by altering hydrogen incorporation in the lattice. Density functional theory calculations were used to examine hydrogen location in the Ga2O3 lattice and identified a new donor type as the source of this remarkable n-type conductivity. Positron annihilation spectroscopy measurements confirm this finding and the interpretation of the experimental results. This work illustrates a new approach that allows a tunable and reversible way of modifying the conductivity of semiconductors and it is expected to have profound implications on semiconductor field. At the same time, it demonstrates for the first time p-type and remarkable n-type conductivity in Ga2O3 which should usher in the development of Ga2O3 devices and advance optoelectronics and high-power devices.

"Cryogenic Stress-Driven Grain Growth Observed via Microcompression with in situ Electron Backscatter Diffraction" J. L. Bair, E. R. Homer, P. Hosemann, D. Frazer, [2020] JOM · DOI: 10.1007/s11837-020-04075-x · EID: 2-s2.0-85080095402
"Femtosecond Laser Ablation for Mesoscale Specimen Evaluation" J. G. Gigax, P. Hosemann, Q. McCulloch, [2020] JOM · DOI: 10.1007/s11837-020-04045-3 · EID: 2-s2.0-85079447137
"High-Temperature Nanoindentation of SiC/SiC Composites" C. P. Deck, P. Hosemann, D. Frazer, [2020] JOM · DOI: 10.1007/s11837-019-03860-7 · EID: 2-s2.0-85074799386
"In Situ Micropillar Compression Tests of 304 Stainless Steels After Ion Irradiation and Helium Implantation" David Frazer, Ce Zheng, Peter Hosemann, Djamel Kaoumi, Ryan Schoell, [2020] JOM · DOI: 10.1007/s11837-020-04127-2 · EID: 2-s2.0-85082954591
"In-Situ Characterization Techniques for Investigating Nuclear Materials" D. Frazer, S. Agarwal, C. A. Yablinsky, P. Hosemann, [2020] JOM · DOI: 10.1007/s11837-020-04130-7 · EID: 2-s2.0-85083114115
"In-Situ Transmission Electron Microscopy Microcantilever and Nanoindentation Testing of UO2" B. Shaffer, P. Peralta, P. Hosemann, D. Frazer, [2020] JOM · DOI: 10.1007/s11837-020-04102-x · EID: 2-s2.0-85083355950
"Key mechanistic features of swelling and blistering of helium-ion-irradiated tungsten" Peter Hosemann, Mehdi Balooch, Frances I. Allen, [2020] Scripta Materialia · DOI: 10.1016/j.scriptamat.2019.11.039 · EID: 2-s2.0-85075531751
"Localized Helium Implantation in SiCf/SiCm Composites Comparing Fiber and Matrix Swelling" D. Frazer, M. P. Popovic, M. Balooch, S. Stevenson, A. Scott, J. Kabel, P. Hosemann, M. V. Ambat, [2020] JOM · DOI: 10.1007/s11837-019-03869-y · EID: 2-s2.0-85074700004
"Localized Helium Implantation in SiCf/SiCm Composites Comparing Fiber and Matrix Swelling" D. Frazer, M. P. Popovic, M. Balooch, S. Stevenson, A. Scott, J. Kabel, P. Hosemann, M. V. Ambat, [2020] JOM · DOI: 10.1007/s11837-019-03869-y
"Measurement and Simulation of Vacancy Formation in 2-MeV Self-irradiated Pure Fe" M. O. Liedke, F. A. Selim, B. P. Uberuaga, A. Wagner, P. Hosemann, R. Auguste, [2020] JOM · DOI: 10.1007/s11837-020-04116-5 · EID: 2-s2.0-85083377579
"Separation of Uptake of Water and Ions in Porous Materials Using Energy Resolved Neutron Imaging" Luke Daemen, Peter Hosemann, Heinz Nakotte, Anton Tremsin, Sven C. Vogel, Penggang Wang, Folker H. Wittmann, Adrian S. Losko, [2020] JOM · DOI: 10.1007/s11837-020-04101-y · EID: 2-s2.0-85082829103
"Towards Bridging the Experimental Length-Scale Gap for Tensile Tests on Structural Materials: Lessons Learned from an Initial Assessment of Microtensile Tests and the Path Forward" Hi Vo, Ryan Finkelstein, Peter Hosemann, Assel Aitkaliyeva, Tanvi Ajantiwalay, [2020] JOM · DOI: 10.1007/s11837-019-03897-8 · EID: 2-s2.0-85075151130
"Applying a new push-to-pull micro-tensile testing technique to evaluate the mechanical properties of high dose Inconel X-750" C.D. Judge, P. Hosemann, C. Howard, [2019] Materials Science and Engineering A · DOI: 10.1016/j.msea.2019.01.113 · EID: 2-s2.0-85061075957
"Correlating high temperature mechanical and tribological properties of CrAlN and CrAlSiN hard coatings" Marisa Rebelo de Figueiredo, Hi Vo, Ao Xia, Shraddha J. Vachhani, Szilard Kolozsvári, Peter Hosemann, Robert Franz, Aljaž Drnovšek, [2019] Surface and Coatings Technology · DOI: 10.1016/j.surfcoat.2019.05.044 · EID: 2-s2.0-85066017379
"Elevated temperature microcantilever testing of fresh U-10Mo fuel" D. Jadernas, N. Bolender, J. Madden, J. Giglio, P. Hosemann, D. Frazer, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2019.151746 · EID: 2-s2.0-85070948290
"Helium irradiation of Y2O3-Fe bilayer system" D. Frazer, P. Hosemann, K. Sridharan, A. Mairov, [2019] Scripta Materialia · DOI: 10.1016/j.scriptamat.2018.11.006 · EID: 2-s2.0-85056580104
"In situ SEM microtensile testing of oxidized grain boundaries in Alloy 600" [2019] 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019 · EID: 2-s2.0-85080073002
"In situ microtensile testing for ion beam irradiated materials" A. Reinhardt, D. Frazer, N. Bailey, P. Chou, P. Hosemann, H. T. Vo, [2019] Minerals, Metals and Materials Series · DOI: 10.1007/978-3-030-04639-2_38 · EID: 2-s2.0-85064062171
"In situ sem push-to-pull micro-tensile testing of ex-service inconel X-750" C. D. Judge, H. T. Vo, M. Griffiths, P. Hosemann, C. Howard, [2019] Minerals, Metals and Materials Series · DOI: 10.1007/978-3-030-04639-2_48 · EID: 2-s2.0-85064062148
"In situ small-scale mechanical testing under extreme environments" Peter Hosemann, Jon Molina-Aldareguia, Jeffrey M. Wheeler, Afrooz Barnoush, [2019] MRS Bulletin · DOI: 10.1557/mrs.2019.126 · EID: 2-s2.0-85067073381
"Interface characterization of candidate dual-purpose barrier coatings for SiC/SiC accident tolerant fuel cladding" [2019] 19th International Conference on Environmental Degradation of Materials in Nuclear Power Systems - Water Reactors, EnvDeg 2019 · EID: 2-s2.0-85080034549
"Ion irradiation effects on commercial PH 13-8 Mo maraging steel Corrax" Ryan Schoell, Peter Hosemann, Djamel Kaoumi, Ce Zheng, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2018.11.041 · EID: 2-s2.0-85058006280
"Linking microstructure and local mechanical properties in SiC-SiC fiber composite using micromechanical testing" Phani Karamched, Christian Deck, Peter Hosemann, David E.J. Armstrong, Yevhen Zayachuk, [2019] Acta Materialia · DOI: 10.1016/j.actamat.2019.02.001 · EID: 2-s2.0-85061788736
"Manufacturing Oxide Dispersion-Strengthened (ODS) Steel Fuel Cladding Tubes Using the Cold Spray Process" Hwasung Yeom, Benjamin Maier, Greg Johnson, Tyler Dabney, Jeffrey Graham, Peter Hosemann, David Hoelzer, Stuart Maloy, Kumar Sridharan, Mia Lenling, [2019] JOM · DOI: 10.1007/s11837-019-03582-w · EID: 2-s2.0-85067392001
"Micropillar compression response of femtosecond laser-cut single crystal Cu and proton irradiated Cu" Hi Vo, Quinn McCulloch, Matthew Chancey, Yongqiang Wang, Stuart A. Maloy, Nan Li, Peter Hosemann, Jonathan G. Gigax, [2019] Scripta Materialia · DOI: 10.1016/j.scriptamat.2019.05.004 · EID: 2-s2.0-85066983331
"Nano- and micro-indentation testing of sintered UO 2 fuel pellets with controlled microstructure and stoichiometry" David Frazer, Tiankai Yao, Peter Hosemann, Michael Tonks, Jie Lian, Bowen Gong, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2019.01.021 · EID: 2-s2.0-85060235260
"Oxidative passivation of Fe–Cr–Al steels in lead-bismuth eutectic under oxygen-controlled static conditions at 700° and 800 °C" A.M. Bolind, Y. Aussat, A.J. Gubser, P. Hosemann, M.P. Popovic, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2019.06.004 · EID: 2-s2.0-85066954248
"Plasticity of UO2 studied and quantified via elevated temperature micro compression testing" P. Hosemann, D. Frazer, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2019.07.022 · EID: 2-s2.0-85069952723
"Response of 14YWT alloys under neutron irradiation: A complementary study on microstructure and mechanical properties" J.S. Weaver, U. Carvajal-Nunez, M.M. Schneider, J.G. Gigax, D.L. Krumwiede, P. Hosemann, T.A. Saleh, N.A. Mara, D.T. Hoelzer, B. Hilton, S.A. Maloy, E. Aydogan, [2019] Acta Materialia · DOI: 10.1016/j.actamat.2019.01.041 · EID: 2-s2.0-85061120486
"Synthesis of amidoxime polymer gel to extract uranium compound from seawater by UV radiation curing" Doonyapong Wongsawaeng, Peter Hosemann, Wijittra Wongjaikham, [2019] Journal of Nuclear Science and Technology · DOI: 10.1080/00223131.2019.1602485 · EID: 2-s2.0-85064478761
"The Application of the OPTICS Algorithm to Cluster Analysis in Atom Probe Tomography Data" Daniel K. Schreiber, Nathan Bailey, Peter Hosemann, Mychailo B. Toloczko, Jing Wang, [2019] Microscopy and Microanalysis · DOI: 10.1017/s1431927618015386 · EID: 2-s2.0-85062649270
Abstract

Atom probe tomography (APT) is a powerful technique to characterize buried three-dimensional nanostructures in a variety of materials. Accurate characterization of those nanometer-scale clusters and precipitates is of great scientific significance to understand the structure–property relationships and the microstructural evolution. The current widely used cluster analysis method, a variant of the density-based spatial clustering of applications with noise algorithm, can only accurately extract clusters of the same atomic density, neglecting several experimental realities, such as density variations within and between clusters and the nonuniformity of the atomic density in the APT reconstruction itself (e.g., crystallographic poles and other field evaporation artifacts). This clustering method relies heavily on multiple input parameters, but ideal selection of those parameters is challenging and oftentimes ambiguous. In this study, we utilize a well-known cluster analysis algorithm, called ordering points to identify the clustering structures, and an automatic cluster extraction algorithm to analyze clusters of varying atomic density in APT data. This approach requires only one free parameter, and other inputs can be estimated or bounded based on physical parameters, such as the lattice parameter and solute concentration. The effectiveness of this method is demonstrated by application to several small-scale model datasets and a real APT dataset obtained from an oxide-dispersion strengthened ferritic alloy specimen.

"Thermophysical properties of thorium mononitride from 298 to 1700 K" J.T. White, P. Hosemann, A.T. Nelson, S.S. Parker, [2019] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2019.151760 · EID: 2-s2.0-85071019651
"α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys" E. Martinez, K. March, O. El-Atwani, D. L. Krumwiede, P. Hosemann, T. Saleh, S. A. Maloy, E. Aydogan, [2019] Scientific Reports · DOI: 10.1038/s41598-019-44508-5 · EID: 2-s2.0-85066942625
Abstract

Nanostructured ferritic alloys are considered as candidates for structural components in advanced nuclear reactors due to a high density of nano-oxides (NOs) and ultrafine grain sizes. However, bimodal grain size distribution results in inhomogeneous NO distribution, or vice versa. Here, we report that density of NOs in small grains (<0.5 µm) is high while there are almost no NOs inside the large grains (>2 µm) before and after irradiation. After 6 dpa neutron irradiation at 385–430 °C, α′ precipitation has been observed in these alloys; however, their size and number densities vary considerably in small and large grains. In this study, we have investigated the precipitation kinetics of α′ particles based on the sink density, using both transmission electron microscopy and kinetic Monte Carlo simulations. It has been found that in the presence of a low sink density, α′ particles form and grow faster due to the existence of a larger defect density in the matrix. On the other hand, while α′ particles form far away from the sink interface when the sink size is small, Cr starts to segregate at the sink interface with the increase in the sink size. Additionally, grain boundary characteristics are found to determine the radiation-induced segregation of Cr.

"A novel approach to advanced nanostructured materials manufacturing" [2018] Transactions of the American Nuclear Society · EID: 2-s2.0-85062990289
"A novel in-situ, lift-out, three-point bend technique to quantify the mechanical properties of an ex-service neutron irradiated inconel X-750 component" C.D. Judge, D. Poff, S. Parker, M. Griffiths, P. Hosemann, C. Howard, [2018] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.10.002 · EID: 2-s2.0-85031749737
"A study of deformation and strain induced in bulk by the oxide layers formation on a Fe-Cr-Al alloy in high-temperature liquid Pb-Bi eutectic" K. Chen, H. Shen, C.V. Stan, D.L. Olmsted, N. Tamura, M. Asta, M.D. Abad, P. Hosemann, M.P. Popovic, [2018] Acta Materialia · DOI: 10.1016/j.actamat.2018.03.041 · EID: 2-s2.0-85045447028
"A study of the effects of minor additives to Pb-Bi eutectic: Designing novel Pb-Bi-X liquid alloys for heat transfer applications" D.L. Olmsted, A.M. Bolind, M. Asta, S. Sohn, J. Schroers, R. Shao, P. Hosemann, M.P. Popović, [2018] Materials and Design · DOI: 10.1016/j.matdes.2018.08.044 · EID: 2-s2.0-85052920153
"An analytical method to extract irradiation hardening from nanoindentation hardness-depth curves" A. Prasitthipayong, D. Krumwiede, D.M. Collins, P. Hosemann, S.G. Roberts, A. Kareer, [2018] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.10.049 · EID: 2-s2.0-85032304994
"Ceramic composites: A review of toughening mechanisms and demonstration of micropillar compression for interface property extraction" Peter Hosemann, Yevhen Zayachuk, David E. J. Armstrong, Takaaki Koyanagi, Yutai Katoh, Christian Deck, Joey Kabel, [2018] Journal of Materials Research · DOI: 10.1557/jmr.2017.473 · EID: 2-s2.0-85042789329
"Direct comparison of nanoindentation and tensile test results on reactor-irradiated materials" T. Yamamoto, T.A. Saleh, S.A. Maloy, G.R. Odette, P. Hosemann, D.L. Krumwiede, [2018] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2018.03.021 · EID: 2-s2.0-85044470065
"Enhanced plasticity in 33 DPA neutron irradiated 304Ss with 2-3.7% swelling" [2018] Transactions of the American Nuclear Society · EID: 2-s2.0-85062938872
"Enhancement of uranium recovery from seawater using amidoximated polymer gel synthesized from radiation-polymerization and crosslinking of acrylonitrile and methacrylic acid monomers" Doonyapong Wongsawaeng, Peter Hosemann, Chaiyaruang Kanokworakan, Vareeporn Ratnitsai, Wijittra Wongjaikham, [2018] Journal of Environmental Chemical Engineering · DOI: 10.1016/j.jece.2018.04.016 · EID: 2-s2.0-85045880156
"Impact of a dense helium-bubble superlattice on the deformation of copper by twinning" Zhang-Jie Wang, Peter Hosemann, D.C. Chrzan, Ian S. Winter, [2018] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2018.05.056 · EID: 2-s2.0-85048079030
"Impact of interfaces on the radiation response and underlying defect recovery mechanisms in nanostructured Cu-Fe-Ag" David Frazer, Andrea Bachmaier, Yongqiang Wang, Peter Hosemann, Daniel Kiener, Michael Wurmshuber, [2018] Materials and Design · DOI: 10.1016/j.matdes.2018.11.007 · EID: 2-s2.0-85056272281
"Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures" S.J. Vachhani, S.J. Tumey, A.M. Minor, P. Hosemann, A. Prasitthipayong, [2018] Acta Materialia · DOI: 10.1016/j.actamat.2017.11.001 · EID: 2-s2.0-85037358288
"Irradiation damage investigation of helium implanted polycrystalline copper" D. Frazer, M. Balooch, P. Hosemann, Y. Yang, [2018] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2018.09.022 · EID: 2-s2.0-85054755332
"Local control of defects and switching properties in ferroelectric thin films" Ruijuan Xu, Frances I. Allen, Joshua Maher, Joshua C. Agar, Ran Gao, Peter Hosemann, Lane W. Martin, Sahar Saremi, [2018] Physical Review Materials · DOI: 10.1103/physrevmaterials.2.084414 · EID: 2-s2.0-85059640619
"Materials selection for nuclear applications: Challenges and opportunities" D. Frazer, M. Fratoni, A. Bolind, M.F. Ashby, P. Hosemann, [2018] Scripta Materialia · DOI: 10.1016/j.scriptamat.2017.04.027 · EID: 2-s2.0-85020423119
"Micro mechanical testing of candidate structural alloys for Gen-IV nuclear reactors" D. Frazer, A. Kareer, M.D. Abad, A. Garner, B. Joni, T. Ungar, G. Ribarik, M. Preuss, L. Balogh, S.J. Tumey, A.M. Minor, P. Hosemann, A. Prasitthipayong, [2018] Nuclear Materials and Energy · DOI: 10.1016/j.nme.2018.05.018 · EID: 2-s2.0-85048783969
"Micro-cantilever testing of environmental barrier coatings on CVD SiC" [2018] Transactions of the American Nuclear Society · EID: 2-s2.0-85062993516
"Oxidation Kinetics of Ferritic Alloys in High-Temperature Steam Environments" Josh White, Peter Hosemann, Andrew Nelson, Stephen S. Parker, [2018] JOM · DOI: 10.1007/s11837-017-2639-5 · EID: 2-s2.0-85032802241
"Small-scale mechanical testing on nuclear materials: bridging the experimental length-scale gap" Peter Hosemann, [2018] Scripta Materialia · DOI: 10.1016/j.scriptamat.2017.04.026 · EID: 2-s2.0-85019912217
"Synthesis, sintering, and thermophysical properties of thorium mononitride" [2018] Transactions of the American Nuclear Society · EID: 2-s2.0-85062995836
"The influence of Al content in steels and oxygen concentration in liquid LBE on the corrosion protection of structural steel candidates for generation IV FBRs" [2018] Transactions of the American Nuclear Society · EID: 2-s2.0-85062943693
"Transmission Electron Microscopy (TEM) Study of the Oxide Layers Formed on Fe-12Cr-4Al Ferritic Alloy in an Oxygenated Pb-Bi Environment at 800°C" Y. Yang, A. M. Bolind, V. B. Ozdol, D. L. Olmsted, M. Asta, P. Hosemann, M. P. Popovic, [2018] JOM · DOI: 10.1007/s11837-018-2951-8 · EID: 2-s2.0-85048363920
"Compatibility studies on Mo–coating systems for nuclear fuel cladding applications" Peter Hosemann, Andreas M. Glaeser, Cristian Cionea, Huan Chin Koh, [2017] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.09.034 · EID: 2-s2.0-85030869810
"Effects of high temperature pre-strain on hardness and creep behavior of UO 2 between 25 and 500 °C: A nanoindentation study" [2017] Transactions of the American Nuclear Society · EID: 2-s2.0-85062026871
"Evaluation of simultaneous ion irradiation and liquid metal corrosion" [2017] Transactions of the American Nuclear Society · EID: 2-s2.0-85062016554
"Evaluation of the Mechanical Properties of TRISO Particles Using Nanoindentation and Ring Compression Testing" J. Szornel, D. L. Krumwiede, K. A. Terrani, P. Hosemann, D. Frazer, [2017] Experimental Mechanics · DOI: 10.1007/s11340-017-0277-z · EID: 2-s2.0-85018478591
"In situ micro-tensile testing on proton beam-irradiated stainless steel" A. Reichardt, D. Frazer, N. Bailey, P. Chou, P. Hosemann, H.T. Vo, [2017] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.06.026 · EID: 2-s2.0-85021412703
"Indentation cracking behaviour and structures of nanophase separation of glasses" Chengyu Song, Peter Ercius, , Cristian Cionea, Peter Hosemann, , Shangcong Cheng, [2017] Physics and Chemistry of Glasses: European Journal of Glass Science and Technology Part B · DOI: 10.13036/17533562.58.6.040 · EID: 2-s2.0-85033796372
"Micro-mechanical evaluation of SiC-SiC composite interphase properties and debond mechanisms" Y. Yang, M. Balooch, C. Howard, T. Koyanagi, K.A. Terrani, Y. Katoh, P. Hosemann, J. Kabel, [2017] Composites Part B: Engineering · DOI: 10.1016/j.compositesb.2017.07.035 · EID: 2-s2.0-85030172760
"Nanoindentation and in situ microcompression in different dose regimes of proton beam irradiated 304 SS" A. Lupinacci, D. Frazer, N. Bailey, H. Vo, C. Howard, Z. Jiao, A.M. Minor, P. Chou, P. Hosemann, A. Reichardt, [2017] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.01.036 · EID: 2-s2.0-85012299363
"Nanomechanical characterization of the tensile modulus of rupture for kerogen-rich shale" [2017] SPE Journal · EID: 2-s2.0-85016480422
"Ni interlayer to improve low-pressure diffusion bonding of 316L SS press fit tube-to-tubesheet joints for coiled tube gas heaters" Alan Bolind, Nils Haneklaus, Cristian Cionea, Charalampos Andreades, Grant Buster, Peter Hosemann, Per Peterson, Rony Reuven, [2017] Journal of Nuclear Engineering and Radiation Science · DOI: 10.1115/1.4035725 · EID: 2-s2.0-85018474985

This study suggests a new approach to diffusion bonding (DB) 316L stainless steel: a low-pressure procedure that includes a nickel interlayer. In this approach, relatively lower pressure is applied to the sample before the DB process, in contrast to the usual approach in which higher pressure is applied during the DB process. This new procedure was tested on mock-up 316L stainless steel tube-to-tubesheet joints, which simulated similar joints in coiled-tube heat-exchanger applications. This study confirms that the new procedure meets the overall success criteria, namely, a pull-out force exceeding the force required for tube rupture. It also shows that the DB joint is improved by the use of a Ni interlayer; the joint strength increased by approximately 33% for a 0.25 μm Ni interlayer and by approximately 18% for a 5 μm Ni interlayer. The joint cross sections were qualitatively examined using optical microscopy (OM) and scanning electron microscopy (SEM); the observations suggest that only portions of the interface were diffusion bonded, as a result of the low-pressure procedure and the surface roughness (due to the sample fabrication). The portions that were diffusion bonded, though, were sound, as characterized by the fact that the steel grains grew through the interface line to create a continuous metallographic structure.

"Performance evaluation and post-irradiation examination of a novel LWR fuel composed of U0.17ZrH1.6 fuel pellets bonded to Zircaloy-2 cladding by lead bismuth eutectic" Donald R. Olander, Kurt A. Terrani, Peter Hosemann, Andrew M. Casella, David J. Senor, Edgar C. Buck, Mehdi Balooch, [2017] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2016.08.020 · EID: 2-s2.0-84990871959
"Post irradiation examination of fast neutron irradiated 14YWT tubes at nuclear science user facilities" [2017] Transactions of the American Nuclear Society · EID: 2-s2.0-85033440028
"Small-scale mechanical testing of UO2" [2017] Transactions of the American Nuclear Society · EID: 2-s2.0-85033456814
"Spherical nanoindentation of proton irradiated 304 stainless steel: A comparison of small scale mechanical test techniques for measuring irradiation hardening" Siddhartha Pathak, Ashley Reichardt, Hi T. Vo, Stuart A. Maloy, Peter Hosemann, Nathan A. Mara, Jordan S. Weaver, [2017] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2017.06.031 · EID: 2-s2.0-85021668381
"The influence of microstructure on the cyclic deformation and damage of copper and an oxide dispersion strengthened steel studied via in-situ micro-beam bending" R. Fritz, M. Alfreider, D. Kiener, P. Hosemann, C. Howard, [2017] Materials Science and Engineering A · DOI: 10.1016/j.msea.2017.01.073 · EID: 2-s2.0-85012306089
"Tolerance to structural disorder and tunable mechanical behavior in self-Assembled superlattices of polymer-grafted nanocrystals" Xingchen Ye, David M. Koshy, Shraddha Vachhani, Peter Hosemann, A. Paul Alivisatos, X. Wendy Gu, [2017] Proceedings of the National Academy of Sciences of the United States of America · DOI: 10.1073/pnas.1618508114 · EID: 2-s2.0-85015429412
Significance

Polymer nanocomposites containing nanoparticle fillers often have enhanced strength, stiffness, and toughness that are highly dependent on nanoparticle spatial distribution, which can be challenging to control in the limit of high nanoparticle loading. Solid superlattices formed from close-packed, ligand-coated inorganic nanocrystals can have high stiffness and large elastic recovery, although nanocrystals interact solely through van der Waals forces. We use polymer-grafted nanocrystals to make superlattices with versatile structural architecture and dimensions to investigate the effects of structural defects, film thickness, and polymer length on mechanical behavior. We find that the elastic response of the superlattice is large even when the arrangement of nanocrystals within the superlattice is perturbed, and that polymer conformation plays a large role in determining mechanical properties.

"A high temperature mechanical study on PH 13-8 Mo maraging steel" M.D. Abad, J.K. Ramsey, M. Rebelo de Figueiredo, D. Kaoumi, N. Li, M. Asta, N. Gronbech-Jensen, P. Hosemann, Z. Huang, [2016] Materials Science and Engineering A · DOI: 10.1016/j.msea.2015.10.077 · EID: 2-s2.0-84946888183
"Characterization of a Viking Blade Fabricated by Traditional Forging Techniques" D. Frazer, N. Bailey, R. Traylor, J. Austin, J. Pringle, J. Bickel, R. Connick, W. Connick, P. Hosemann, H. Vo, [2016] JOM · DOI: 10.1007/s11837-016-2109-5 · EID: 2-s2.0-84988643624
"Characterization of sic-sic composites for application in current and advanced nuclear reactors" [2016] International Congress on Advances in Nuclear Power Plants, ICAPP 2016 · EID: 2-s2.0-84986325494
"Degradation of HT9 under simultaneous ion beam irradiation and liquid metal corrosion" S. Qvist, S. Parker, D.L. Krumwiede, M. Caro, J. Tesmer, S.A. Maloy, Y.Q. Wang, P. Hosemann, D. Frazer, [2016] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2016.06.039 · EID: 2-s2.0-84989878751
"Development and characterization of Ti-6Al-4V to 304L stainless steel gradient components fabricated with laser deposition additive manufacturing" R. Peter Dillon, John Paul Borgonia, Andrew A. Shapiro, Bryan W. McEnerney, Tatsuki Momose, Peter Hosemann, Ashley Reichardt, [2016] Materials and Design · DOI: 10.1016/j.matdes.2016.05.016 · EID: 2-s2.0-84969815995
"Development of engineering parameters for low pressure diffusion bonds of 316 SS tube-to-tube sheet joints for fhr heat exchangers" [2016] TMS Annual Meeting · EID: 2-s2.0-85003000293
"Effect of strain and temperature on the threshold displacement energy in body-centered cubic iron" Mark Asta, Peter Hosemann, Niels Grønbech-Jensen, Benjamin Beeler, [2016] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2016.03.017 · EID: 2-s2.0-84963585213
"Energy technology 2015: Carbon dioxide management and other technologies" [2016] Energy Technology 2015: Carbon Dioxide Management and Other Technologies · DOI: 10.1007/978-3-319-48220-0 · EID: 2-s2.0-85028801285
"Evaluation of mechanical properties of 304 ss after proton irradiation using small scale mechanical testing" [2016] International Congress on Advances in Nuclear Power Plants, ICAPP 2016 · EID: 2-s2.0-84986229846
"Fabrication of diffusion bonded 316L Stainless steel Tube-To-Tube sheet joints for fhr coil tube gas heaters - An overview" [2016] International Congress on Advances in Nuclear Power Plants, ICAPP 2016 · EID: 2-s2.0-84986277844
"Hybrid friction diffusion bonding of 316L stainless steel tube-to-tube sheet joints for coil-wound heat exchangers" Cristian Cionea, Rony Reuven, David Frazer, Peter Hosemann, Per F. Peterson, Nils Haneklaus, [2016] Journal of Mechanical Science and Technology · DOI: 10.1007/s12206-016-0832-z · EID: 2-s2.0-84994494782
"Initial studies on the correlation of nanohardness to engineering-scale properties of neutron-irradiated steels" [2016] International Congress on Advances in Nuclear Power Plants, ICAPP 2016 · EID: 2-s2.0-84986212689
"Interface dominated mechanical properties of ultra-fine grained and nanoporous Au at elevated temperatures" V. Maier-Kiener, J. Jeong, M.D. Abad, P. Hosemann, S.H. Oh, D. Kiener, A. Leitner, [2016] Acta Materialia · DOI: 10.1016/j.actamat.2016.08.071 · EID: 2-s2.0-84987825096
"Investigation of specimen size effects by in-situ microcompression of equal channel angular pressed copper" D. Frazer, A. Lupinacci, S. Parker, R.Z. Valiev, C. Shin, B. William Choi, P. Hosemann, C. Howard, [2016] Materials Science and Engineering A · DOI: 10.1016/j.msea.2015.09.110 · EID: 2-s2.0-84943608733
"Joining of Inconel 718 and 316 Stainless Steel using electron beam melting additive manufacturing technology" Jorge Mireles, Ashley Reichardt, Pedro Frigola, Peter Hosemann, Lawrence E. Murr, Ryan B. Wicker, Alejandro Hinojos, [2016] Materials and Design · DOI: 10.1016/j.matdes.2016.01.041 · EID: 2-s2.0-84958042711
"Mechanical behavior of copper containing a gas-bubble superlattice" Frances I. Allen, Zhi-Wei Shan, Peter Hosemann, Zhang-Jie Wang, [2016] Acta Materialia · DOI: 10.1016/j.actamat.2016.08.085 · EID: 2-s2.0-84987792289
"Modernized mechanical testing of kerogen-rich shales (KRS) by monitoring in situ microscale tensile failures" [2016] 50th US Rock Mechanics / Geomechanics Symposium 2016 · EID: 2-s2.0-85010375298
"Multi scale characterization of SiC/SiC composite materials" M. D. Abad, C. Back, C. Deck, P. Hosemann, D. Frazer, [2016] Advanced Composites for Aerospace, Marine, and Land Applications · DOI: 10.1007/978-3-319-48096-1_15 · EID: 2-s2.0-85015036218
"Oxide scale formation on 316L and FeCrAl steels exposed to oxygen controlled static LBE at temperatures up to 800 °C" M.D. Abad, Y. Aussat, D. Frazer, A.J. Gubser, P. Hosemann, C. Cionea, [2016] Solar Energy Materials and Solar Cells · DOI: 10.1016/j.solmat.2015.09.007 · EID: 2-s2.0-84942475066
"Sic-Sic composite interphase evaluation via small scale mechanical testing" [2016] Transactions of the American Nuclear Society · EID: 2-s2.0-85032950477
"Stability domain of alumina thermally grown on Fe-Cr-Al-based model alloys and modified surface layers exposed to oxygen-containing molten Pb" R. Fetzer, A. Weisenburger, S. Doyle, M. Bruns, A. Heinzel, P. Hosemann, G. Mueller, A. Jianu, [2016] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2015.12.009 · EID: 2-s2.0-84951293083
"The crystal structure, orientation relationships and interfaces of the nanoscale oxides in nanostructured ferritic alloys" Jim Ciston, Stephan Kräemer, Nathan Bailey, G. Robert Odette, Peter Hosemann, Yuan Wu, [2016] Acta Materialia · DOI: 10.1016/j.actamat.2016.03.031 · EID: 2-s2.0-84961900229
"The granular and polymer composite nature of kerogen-rich shale" K. L. Hull, Y. Han, G. Al-Muntasheri, P. Hosemann, S. Parker, C. B. Howard, Y. N. Abousleiman, [2016] Acta Geotechnica · DOI: 10.1007/s11440-016-0435-y · EID: 2-s2.0-84957607059
"Tube expansion and diffusion bonding of 316L stainless steel tube-to-tube sheet joints using a commercial roller tube expander" Rony Reuven, Cristian Cionea, Peter Hosemann, Per F. Peterson, Nils Haneklaus, [2016] Journal of Materials Processing Technology · DOI: 10.1016/j.jmatprotec.2016.03.008 · EID: 2-s2.0-84960910345
"Twin boundary-accelerated ferritization of austenitic stainless steels in liquid lead-bismuth eutectic" D. Frazer, E. Stergar, K. Lambrinou, P. Hosemann, [2016] Scripta Materialia · DOI: 10.1016/j.scriptamat.2016.02.029 · EID: 2-s2.0-84962219103
"A high temperature nanoindentation study of Al-Cu wrought alloy" Manuel D. Abad, Susanna Renhart, Helmut Antrekowitsch, Peter Hosemann, Susanne Koch, [2015] Materials Science and Engineering A · DOI: 10.1016/j.msea.2015.07.066 · EID: 2-s2.0-84938245154
"An intermetallic forming steel under radiation for nuclear applications" E. Stergar, S.A. Maloy, Y.Q. Wang, P. Hosemann, C. Hofer, [2015] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2014.12.099 · EID: 2-s2.0-84920749770
"Atom probe tomography analysis of high dose MA957 at selected irradiation temperatures" Erich Stergar, Mychailo Toloczko, Peter Hosemann, Nathan A. Bailey, [2015] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2015.01.006 · EID: 2-s2.0-84922749924
"Characterization of ion beam irradiated 304 stainless steel utilizing nanoindentation and Laue microdiffraction" K. Chen, Y. Li, M. Kunz, Z. Jiao, G.S. Was, M.D. Abad, A.M. Minor, P. Hosemann, A. Lupinacci, [2015] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2014.11.050 · EID: 2-s2.0-84919820385
"Computationally-efficient stochastic cluster dynamics method for modeling damage accumulation in irradiated materials" Jaime Marian, Vasily V. Bulatov, Peter Hosemann, Tuan L. Hoang, [2015] Journal of Computational Physics · DOI: 10.1016/j.jcp.2015.07.061 · EID: 2-s2.0-84939552886
"Diffusion bonding of 316 SS tube-to-tube sheet joints using a commercial tube expander" [2015] Transactions of the American Nuclear Society · EID: 2-s2.0-85063495929
"Effect of interfaces on radiation damage accumulation in FeNiAl maraging steels" [2015] Transactions of the American Nuclear Society · EID: 2-s2.0-84988891995
"Effects of applied strain on radiation damage generation in body-centered cubic iron" Mark Asta, Peter Hosemann, Niels Grønbech-Jensen, Benjamin Beeler, [2015] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2014.12.111 · EID: 2-s2.0-84921784865
"Elevated temperature mechanical properties of novel ultra-fine grained Cu-Nb composites" Manuel David Abad, Peter Hosemann, Marius Kreuzeder, Verena Maier, Daniel Kiener, Mladen-Mateo Primorac, [2015] Materials Science and Engineering A · DOI: 10.1016/j.msea.2014.12.020 · EID: 2-s2.0-84920278774
"Evaluation of the Mechanical Properties of Naturally Grown Multilayered Oxides Formed on HCM12A Using Small Scale Mechanical Testing" S. Parker, D. Frazer, M. Rebelo de Figueiredo, A. Lupinacci, K. Kikuchi, P. Hosemann, M. D. Abad, [2015] Oxidation of Metals · DOI: 10.1007/s11085-015-9551-6 · EID: 2-s2.0-84946474779
"In situ micro tensile testing of He+2 ion irradiated and implanted single crystal nickel film" Mihail Ionescu, Joel Davis, Lyndon Edwards, R.P. Harrison, Peter Hosemann, Dhriti Bhattacharyya, Ashley Reichardt, [2015] Acta Materialia · DOI: 10.1016/j.actamat.2015.08.028 · EID: 2-s2.0-84941331775
"Localized mechanical property assessment of SiC/SiC composite materials" M.D. Abad, D. Krumwiede, C.A. Back, H.E. Khalifa, C.P. Deck, P. Hosemann, D. Frazer, [2015] Composites Part A: Applied Science and Manufacturing · DOI: 10.1016/j.compositesa.2014.11.008 · EID: 2-s2.0-84920683973
"Microstructure and mechanical properties of CuxNb1-x alloys prepared by ball milling and high pressure torsion compacting" S. Parker, D. Kiener, M.-M. Primorac, P. Hosemann, M.D. Abad, [2015] Journal of Alloys and Compounds · DOI: 10.1016/j.jallcom.2014.11.193 · EID: 2-s2.0-84921464620
"Nanoindentation of chemical-vapor deposited Al2O3 hard coatings at elevated temperatures" Manuel D. Abad, Adrian J. Harris, Christoph Czettl, Christian Mitterer, Peter Hosemann, Marisa Rebelo de Figueiredo, [2015] Thin Solid Films · DOI: 10.1016/j.tsf.2015.01.069 · EID: 2-s2.0-84925326085
"Nanomechanical Measurements in Harsh Environments" Xiaodong Li, Peter Hosemann, [2015] JOM · DOI: 10.1007/s11837-015-1676-1 · EID: 2-s2.0-84948384474
"New insights on the mechanical characterization of Kerogen-Rich Shale, KRS" [2015] Society of Petroleum Engineers - Abu Dhabi International Petroleum Exhibition and Conference, ADIPEC 2015 · EID: 2-s2.0-84979872992
"Small scale mechanical testing of irradiated materials" C. Shin, D. Kiener, P. Hosemann, [2015] Journal of Materials Research · DOI: 10.1557/jmr.2015.26 · EID: 2-s2.0-84929708093
"Small-Scale Mechanical Testing on Proton Beam-Irradiated 304 SS from Room Temperature to Reactor Operation Temperature" A. Reichardt, C. Howard, M. D. Abad, D. Kaoumi, P. Chou, P. Hosemann, H. Vo, [2015] JOM · DOI: 10.1007/s11837-015-1596-0 · EID: 2-s2.0-84948379441
"Specimen size effects on the weakening of a bulk metastable austenitic alloy" Sangyeob Lim, Hyung-ha Jin, Peter Hosemann, Junhyun Kwon, Chansun Shin, [2015] Materials Science and Engineering A · DOI: 10.1016/j.msea.2014.11.004 · EID: 2-s2.0-84918802993
"Deformation of as-fabricated and helium implanted 100 nm-diameter iron nano-pillars" Qiang Guo, Peter Hosemann, Yongqiang Wang, Julia R. Greer, Peri Landau, [2014] Materials Science and Engineering A · DOI: 10.1016/j.msea.2014.06.052 · EID: 2-s2.0-84903847034
"Microstructure examination of Fe-14Cr ODS ferritic steels produced through different processing routes" P. Hosemann, S.C. Vogel, N. Baluc, Z. Oksiuta, [2014] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2014.04.004 · EID: 2-s2.0-84900420763
"Development of high temperature liquid metal heat transfer fluids for CSP applications" Y. Sungtaek Ju, Jan Schroers, Mark Asta, Peter Hosemann, Gopinath R. Warrier, [2014] ASME 2014 8th International Conference on Energy Sustainability, ES 2014 Collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology · DOI: 10.1115/es2014-6611 · EID: 2-s2.0-84912127048

In response to the DOE Sunshot Initiative to develop low-cost, high efficiency CSP systems, UCLA is leading a multi-university research effort to develop new high temperature heat transfer fluids capable of stable operation at 800°C and above. Due to their operating temperature range, desirable heat transfer properties and very low vapor pressure, liquid metals were chosen as the heat transfer fluid. An overview of the ongoing research effort is presented.

Development of new liquid metal coolants begins with identification of suitable candidate metals and their alloys. Initial selection of candidate metals was based on such parameters as melting temperature, cost, toxicity, stability/reactivity Combinatorial sputtering of the down selected candidate metals is used to fabricate large compositional spaces (∼ 800), which are then characterized using high-throughput techniques (e.g., X-ray diffraction). Massively parallel optical methods are used to determine melting temperatures. Thermochemical modeling is also performed concurrently to compliment the experimental efforts and identify candidate multicomponent alloy systems that best match the targeted properties. The modeling effort makes use of available thermodynamic databases, the computational thermodynamic CALPHAD framework and molecular-dynamics simulations of molten alloys. Refinement of available thermodynamics models are performed by comparison with available experimental data. Characterizing corrosion in structural materials such as steels, when using liquid metals, and strategies to mitigate them are an integral part of this study. The corrosion mitigation strategy we have adopted is based on the formation of stable oxide layers on the structural metal surface which prevents further corrosion. As such oxygen control is crucial in such liquid metal systems. Liquid metal enhanced creep and embrittlement in commonly used structural materials are also being investigated. Experiments with oxygen control are ongoing to evaluate what structural materials can be used with liquid metals. Characterization of the heat transfer during forced flow is another key component of the study. Both experiments and modeling efforts have been initiated. Key results from experiments and modeling performed over the last year are highlighted and discussed.

"Dynamic investigation of defects induced by short, high current pulses of high energy lithium ions" Arun Persaud, Steve Lidia, Andrew M. Minor, P. Hosemann, Peter A. Seidl, Thomas Schenkel, Hua Guo, [2014] Materials Research Society Symposium Proceedings · DOI: 10.1557/opl.2014.856 · EID: 2-s2.0-84924404639
ABSTRACT

We employ intense and short pulses of energetic lithium (Li+) ions to investigate the relaxation dynamics of radiation induced defects in single crystal silicon samples. Ions both create damage and track damage evolution simultaneously at short time scales when we use the channeling effect as a diagnostic tool. Ion pulses, ∼20 to 600 ns long and with peak currents of up to ∼1 A are formed in an induction type linear accelerator, the Neutralized Drift Compression eXperiment at Lawrence Berkeley National Laboratory. By rotating silicon (<100>) membranes of different thicknesses and changing the incident ion energy, the fraction of channeled ions in the transmitted beam could be varied. In preliminary experiments we find that the Li ion intensity is not high enough to generate overlapping cascades (in time and space) that would be necessary to measure a change in the shape of the current waveform of the transmitted ion beam. We discuss the concept of pump-probe type experiments with short ion beam pulses to access defect dynamics in materials and outline a path to increasing damage rates with heavier ions and by the application of longitudinal and lateral pulse compression techniques.

"Fabrication and thermo-mechanical behavior of ultra-fine porous copper" Manuel-David Abad, Mladen-Mateo Primorac, Peter Hosemann, Verena Maier, Daniel Kiener, Marius Kreuzeder, [2014] Journal of Materials Science · DOI: 10.1007/s10853-014-8622-4 · EID: 2-s2.0-84911987051
"Lead-bismuth eutectic as a high temperature heat-transport fluid for thermal solar power" C. Cionea, M. Popovic, Y. Aussat, A. J. Gubser, P. Hosemann, D. Frazer, [2014] ASME 2014 8th International Conference on Energy Sustainability, ES 2014 Collocated with the ASME 2014 12th International Conference on Fuel Cell Science, Engineering and Technology · DOI: 10.1115/es2014-6528 · EID: 2-s2.0-84912126903

In order to increase the thermal efficiency and produce process heat for hydrogen production, the operating temperature of the heat-transfer fluid in thermal solar plants needs to increase, but to increase the operating temperature, new heat-transport liquids need to be evaluated. Liquid metals have been proposed as heat-transport fluids because of the large temperature ranges over which they remain liquid. One of the most studied liquid metals for non-solar applications has been lead-bismuth eutectic alloy (LBE), for the nuclear industry. The main challenge with using LBE as a coolant is that the major constituents of structural steels have high solubility in LBE. In this work, the challenges of using LBE as a high temperature heat-transport fluid are discussed, as well as initial results of high-temperature static corrosion tests of structural steels to evaluate their potential use in a thermal solar power plant.

"Towards pump-probe experiments of defect dynamics with short ion beam pulses" S.M. Lidia, C.D. Weis, W.L. Waldron, J. Schwartz, A.M. Minor, P. Hosemann, J.W. Kwan, T. Schenkel, [2013] Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · DOI: 10.1016/j.nimb.2013.05.074 · EID: 2-s2.0-84901395585
"SANS and TEM of ferritic-martensitic steel T91 irradiated in FFTF up to 184 dpa at 413 °c" O. Anderoglu, R. Dickerson, M. Hartl, P. Dickerson, J.A. Aguiar, P. Hosemann, M.B. Toloczko, S.A. Maloy, J. Van den Bosch, [2013] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2013.04.025 · EID: 2-s2.0-84877842792
"Capability demonstration of simultaneous proton beam irradiation during exposure to molten lead-bismuth eutectic for HT9 steel" Alan Michael Bolind, Peter Hosemann, Yongqiang Wang, Joseph Tesmer, Magdalena Serrano De Caro, Mark Bourke, Staffan Qvist, [2013] Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment · DOI: 10.1016/j.nima.2012.09.014 · EID: 2-s2.0-84867632559
"Structural, electrical and magnetic measurements on oxide layers grown on 316L exposed to liquid lead-bismuth eutectic" Christian Hofer, Gregor Hlawacek, Ning Li, Stuart A. Maloy, Christian Teichert, Peter Hosemann, [2012] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2011.11.042 · EID: 2-s2.0-84155183030
"Nano/Micro Scale Characterization of SiC/SiC Composite Materials" P. Hosemann, C.A. Back, C. Deck, H. Khalifa, D. Frazer, [2012] Microscopy and Microanalysis · DOI: 10.1017/s1431927612008951 · EID: 2-s2.0-85008530315

Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.

"The treatment and disposal of natural radioactive waste from the oil and natural gas industry - Potentials and limitations, Part 2,NORM/TENORM behandlung und deponierung natürlicher radioaktiver rückstände der erdöl- und erdgasindustrie - Möglichkeiten und grenzen, Teil 2" [2012] Aufbereitungs-Technik/Mineral Processing · EID: 2-s2.0-84870406609
"The treatment and disposal of natural radioactive waste from the oil and natural gas industry - Potentials and limitations, part 1,Behandlung und Deponierung natiirlicher radioaktiver Rückstände der Erdöl- und Erdgasindustrie - Möglichkeiten und Grenzen, Teil 1" [2012] Aufbereitungs-Technik/Mineral Processing · EID: 2-s2.0-84867005661
"Macro and microscale mechanical testing and local electrode atom probe measurements of STIP irradiated F82H, Fe-8Cr ODS and Fe-8Cr-2W ODS" E. Stergar, L. Peng, Y. Dai, S.A. Maloy, M.A. Pouchon, K. Shiba, D. Hamaguchi, H. Leitner, P. Hosemann, [2011] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2010.12.200 · EID: 2-s2.0-80053604124
"In situ nanocompression testing of irradiated copper" P. Hosemann, S. A. Maloy, A. M. Minor, D. Kiener, [2011] Nature Materials · DOI: 10.1038/nmat3055 · EID: 2-s2.0-79960621920
"Development and testing of radiation tolerant clad materials for nuclear fuels" [2010] Transactions of the American Nuclear Society · EID: 2-s2.0-79551667246
"How do microstructure and pren affect the erosion corrosion behaviour of stainless steels?" [2009] NACE - International Corrosion Conference Series · EID: 2-s2.0-69249146213
"Nanoscale characterization of HT-9 exposed to lead bismuth eutectic at 550 °C for 3000 h" M.E. Hawley, D. Koury, J. Welch, A.L. Johnson, G. Mori, N. Li, S.A. Maloy, P. Hosemann, [2008] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2008.03.018 · EID: 2-s2.0-54949085373
"Compositional analyses of ion-irradiation-induced phases in δ-Sc4Zr3O12" M. Ishimaru, Y. Hirotsu, I.O. Usov, J.A. Valdez, P. Hosemann, A.L. Johnson, T.T. Thao, K.E. Sickafus, [2008] Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms · DOI: 10.1016/j.nimb.2008.03.227 · EID: 2-s2.0-44649147057
"Corrosion of ODS steels in lead-bismuth eutectic" H.T. Thau, A.L. Johnson, S.A. Maloy, N. Li, P. Hosemann, [2008] Journal of Nuclear Materials · DOI: 10.1016/j.jnucmat.2007.05.049 · EID: 2-s2.0-37549053319
"Characterization of HT-9 ferritic-martensitic steels oxidized in lead bismuth eutectic" [2008] Transactions of the American Nuclear Society · EID: 2-s2.0-55249119514
"Core materials development and testing for the global nuclear energy partnership's advanced burner reactor" [2008] Transactions of the American Nuclear Society · EID: 2-s2.0-55249124758
"Development of diffusion-bonding parameters for tungsten and tantalum to steel" [2008] Proceedings of the 7th International Conference on Tungsten, Refractory and Hardmaterials · EID: 2-s2.0-84883217477
"Influence of impact angles on penetration rates of CRAs exposed to a high velocity multiphase flow" [2008] NACE - International Corrosion Conference Series · EID: 2-s2.0-69249150522
"Influence of strength on the erosion corrosion rate of stainless steels" [2008] 17th International Corrosion Congress 2008: Corrosion Control in the Service of Society · EID: 2-s2.0-84865001219
"Micro mechanic testing and local electrode atom probe microscope (LEAP) measurements on oxide dispersed strengthened (ODS) alloys" [2008] Transactions of the American Nuclear Society · EID: 2-s2.0-55249115086
"Corrosion resistance of ferritic/martensitic ODS alloys in LBE environment and application of MA956" [2006] Transactions of the American Nuclear Society · EID: 2-s2.0-33746048100
Source: ORCID/CrossRef using DOI