Effect of temperature history on the irradiation behavior of vanadium alloy irradiated with the MARICO-II rig in a fast reactor, JOYO

Nuclear Materials and Energy

M. Satou¹  M. Yamazaki²  Ken-ichi Fukumoto³  S. Miura³ 

[1] Hachinohe Institute of Technology, Hachinohe 031-8501, Japan;International Research Center for Nuclear Materials Science Institute for Materials Research, Tohoku University, 311-1313, Japan;Research Institute of Nuclear Engineering, University of Fukui, 914-0055 Tsuruga, Japan;

关键词: Vanadium alloy;    Neutron irradiation;    Temperature history;    Microstructural evolution;    Irradiation technology;   

DOI  :  

来源: DOAJ

【 摘 要 】

The irradiation behavior of vanadium alloys was examined to evaluate the effect of temperature history during reactor operation. Irradiation experiments were performed in a fast reactor, Joyo, with an irradiation-temperature-controlled irradiation rig, MARICO-II. In-core irradiation rigs that control the irradiation temperature and are not influenced by reactor power were used. Irradiation conditions with or without the MARICO-II rig were performed. Significant differences in irradiation hardening and swelling behavior in undersized vanadium binary alloys were visible between temperature-controlled and conventional rigs. The temperature history affects the microstructural evolution, especially the nucleation and growth of voids during startup and shutdown procedures. No difference was observed in the vanadium alloys with oversized solute atom because the vacancy migration was suppressed by tight binding between oversized solute atoms and vacancies during irradiation. V–4Cr–4Ti–(Si,Al,Y) alloys showed significant irradiation hardening at high-temperature irradiation even though the contribution of dislocation and precipitates for irradiation hardening was insufficient to satisfy the measured irradiation hardening. The significant irradiation hardening in the V–4Cr–4Ti–(Si,Al,Y) alloys may be caused by transmission-electron-microscope-invisible clusters including minor elements (Si, Al, Y) that were formed at a high temperature during irradiation.

【 授权许可】

Unknown