報告時間：2025年10月13日（星期一）11:00
報告地點：材料樓601會議室
報 告 人：Kazutoshi Tokunaga，associate professor
工作單位：Kyushu University
舉辦單位：材料科學與工程學院
報告簡介：
In the present work, rolled tungsten in different orientations in accordance with the ITER specifications exposed by multiple irradiations of a negative hydrogen ion beam (3 MeV, 5 Hz, 25,920 s) have been examined to investigate the modification by the repeated short pulse heat loading such as ELMs in the fusion reactor. During the irradiation, the surface temperature has been measured using high response pyrometers. After the irradiations, the surface modification has been observed using an optical microscope and FE-SEM. In addition, microstructure of the cross section of the irradiated tungsten have been also investigated using FE-SEM-EBSD. Crack formation is different depending on the orientation of rolling direction. Cross sectional observation reveals the crack path along high angle grain boundaries and transgranular fracture pattern. Surface roughening and protuberance in the center area surrounded by the cracks are also observed.
報告人簡介：
Kazutoshi Tokunaga, associate professor at Research Institute for Applied Mechanics, Kyushu University. He graduated from Kumamoto University of Science with a bachelor's degree. He graduated from Kyushu University with a doctorate in engineering. Then, he joined the Kyushu University Research Institute for Applied Mechanics as an assistant professor. He has long been engaged in basic research on the plasma-wall interactions and the plasma facing materials in nuclear fusion reactor.
