Post-irradiation annealing behavior of oxide dispersion strengthened Fe-Cr alloys studied by nanoindentation


Post-irradiation annealing behavior of oxide dispersion strengthened Fe-Cr alloys studied by nanoindentation

Duan, B.; Bergner, F.; Heintze, C.; Akhmadaliev, S.; Wang, T.

To study the nature of irradiation-induced nanofeatures in oxide dispersion strengthened (ODS) Fe-Cr alloys, post-irradiation isochronal thermal annealing up to 600 ºC was performed for 9Cr- and 14Cr-ODS alloys ion-irradiated at 300 and 500 ºC. Nanoindentation indicated hardening for all as-irradiated alloys and complete hardness recovery upon post-irradiation annealing. Candidate mechanisms of recovery were critically evaluated. Shrinkage of irradiation-induced dislocation loops via capture of thermal vacancies was found to correctly reflect the behavior of 9Cr-ODS irradiated at 300 ºC.

Keywords: ODS steel; Ion irradiation; Post-irradiation annealing; Nanoindentation; Dislocation loops

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Publ.-Id: 26399