Mack Cullison

Profile Information
Name
Mr. Mack Cullison
Institution
Oregon State University
Position
Research Assistant / Teaching Assistant
Biography
<p>Mack Cullison is currently a PhD student at Oregon State University. His research interest are nuclear material science, specifically, accident tolerant materials, material treatments, and post irradiation characterization.&nbsp;<br></p>
Expertise
Corrosion, EBSD, Nanoindentation, Oxide Dispersion-Strengthened Alloy (ODS), SEM, Transmission Electron Microscopy (TEM)
Publications:
"Microstructure study of U-35 wt.% Zr alloy after quick annealing at 650 °C" Mack Cullison, Journal of Materials Research Vol. 2020 1-8 Link
Uranium–35 wt.% zirconium (U–35 wt.% Zr) alloy was annealed for 1 h and 24 h at 650 °C and characterized to understand the early-stage microstructure evolution. Dendritic microstructure with fine (∼300 nm in length) α-U precipitates clustered between dendrite branches were observed in the 1-h annealed sample. After 24-h annealing at 650 °C, the α-U precipitates coarsened, and the dendritic microstructure disappeared because of microstructure homogenization. Furthermore, microchemical homogenization observed with energy-dispersive X-ray spectroscopy analysis suggests that α-U precipitates are approaching thermodynamic equilibrium in the 24-h annealed sample. The findings from this study have potential impacts on the manufacturing and computer modeling of metallic nuclear fuel.