Speaker
Ryuta Kasada
(Institute of Advanced Energy)
Description
Heavy ion irradiation technique has been used for simulating fusion neutron irradiation on materials. However mechanical testing technologies were limited due to the thin irradiated layer only up to several um in depth. Nanoindentation hardness were often used for evaluating irradiation hardening behaviro of ion-irradiated subsurface. This study investigates micro-pillar compression behavior of ion-irradiated F82H reduced activation ferritic steel. Fe3+3+ ion beam irradiations were carried out by using TIARA facility at 300 degree C up to 3 dpa. Micro-pillar specimens of 1,3, and 10 um in diameter on the unirradiated surface and 1 or 3 um for the ion-irradiated surface were fabricated by focused ion beam (FIB). Compression tests on the micro-pillars were performed by nanoindentation device equipped with a flat punch diamond tip. Yield stress of unirradiated specimens increased with decreasing specimen size. By using the 1 um micro-pillar, irradiation hardening were successfully evaluated as increase of yield stress. Deformation behavior of mciro-pillars before and after the ion-irradiation showed multiple gliding at a same slip system like a single crystal.
Co-authors
Hiroyasu Tanigawa
(JAEA, Rokkasho, Japan)
Masami Ando
(JAEA, Rokkasho, Japan)
Ryota Ihira
(Institute of Advanced Energy, Kyoto University, Uji, Japan)
Ryouke Ochiai
(Institute of Advanced Energy, Kyoto University, Uji, Japan)
Ryuta Kasada
(Institute of Advanced Energy, Kyoto University, Uji, Japan)
Satoshi Konishi
(Institute of Advanced Energy, Kyoto University, Uji, Japan)
Takeshi Miyazawa
(JAEA, Rokkasho, Japan)
