Maria A Auger

Publications:
"Characterisation of nano-scale precipitates in BOR60 irradiated T91 steel using atom probe tomography" Maria A Auger, Moody Michael, Guma Yeli, Victoria Strutt, Paul Bagot, Journal of Nuclear Materials Vol. 543 2021 Link
"Radiation induced segregation and precipitation behavior in self-ion irradiated Ferritic/Martensitic HT9 steel" Maria A Auger, Djamel Kaoumi, Ce Zheng, Michael Moody, Journal of Nuclear Materials Vol. 491 2017 162-176 Link
In this study, Ferritic/Martensitic (F/M) HT9 steel was irradiated to 20 displacements per atom (dpa) at 600 nm depth at 420 and 440 °C, and to 1, 10 and 20 dpa at 600 nm depth at 470 °C using 5 MeV Fe++ ions. The characterization was conducted using ChemiSTEM and Atom Probe Tomography (APT), with a focus on radiation induced segregation and precipitation. Ni and/or Si segregation at defect sinks (grain boundaries, dislocation lines, carbide/matrix interfaces) together with Ni, Si, Mn rich G-phase precipitation were observed in self-ion irradiated HT9 except in very low dose case (1 dpa at 470 °C). Some G-phase precipitates were found to nucleate heterogeneously at defect sinks where Ni and/or Si segregated. In contrast to what was previously reported in the literature for neutron irradiated HT9, no Cr-rich α′ phase, χ-phases, η phase and voids were found in self-ion irradiated HT9. The difference of observed microstructures is probably due to the difference of irradiation dose rate between ion irradiation and neutron irradiation. In addition, the average size and number density of G-phase precipitates were found to be sensitive to both irradiation temperature and dose. With the same irradiation dose, the average size of G-phase increased whereas the number density decreased with increasing irradiation temperature. Within the same irradiation temperature, the average size increased with increasing irradiation dose.
Presentations:
"Nanoscale analysis of neutron irradiated ODS 14YWT ferritic alloy" Maria A Auger, David Hoelzer, Kevin Field, European MRS 2019 May 27-31, (2019)
"Nanoscale characterization of materials by Atom Probe Tomography" Maria A Auger, Seminar -Postgraduate Training Course April 5-5, (2019)