Vacancy migration process in F82H and Fe-Cr binary alloy using positron annihilation lifetime measurement

16th International Conference on Positron Annihilation

Sato, K.^1 ; Xu, Q.^1 ; Hamaguchi, D.^2 ; Huang, S.S.^1 ; Yoshiie, T.^1

Research Reactor Institute, Kyoto University, Kumatori-cho, Sennan-gun, Osaka 590-0494, Japan^1

Japan Atomic Energy Agency, Rokkasho-mura, Kamikita-gun, Aomori, 039-3212, Japan^2

关键词: Dislocation loop;    Interstitials;    Irradiation-induced defects;    Isochronal annealing;    Positron annihilation lifetime measurement;    Solute atoms;    Trapping sites;    Vacancy migration;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012031/pdf
DOI  :  10.1088/1742-6596/443/1/012031

来源: IOP

【 摘 要 】

Microstructral evolution of electron-irradiated F82H and Fe-8%Cr at 77 K was studied using positron annihilation lifetime measurements. Irradiation-induced vacancies started to migrate at 300 K and 180 K in F82H and Fe-8%Cr, respectively. Solute Cr atoms did not suppress vacancy migration, but they made di-vacancies more stable. Microvoids were not formed by annealing. In F82H, solute atoms acted as trapping site of irradiation-induced defects and annihilation of vacancies and interstitials was facilitated. Pre-existing dislocations and precipitates were also their sinks. These lead to the suppression of microvoids formation. In Fe-8%Cr, small vacancy-type dislocation loops were formed by isochronal annealing test.