報告時間：2025年10月13日（星期一）10:30
報告地點：材料樓601會議室
報 告 人：MITSUTAKA MIYAMOTO（宮本光貴）,full professor
工作單位：Shimane University
舉辦單位：材料科學與工程學院
報告簡介：
It is well known that helium atoms introduced into many metals by helium ion bombardment or the (n,α) nuclear reaction generally precipitate as helium bubbles, significantly affecting hydrogen isotope retention behavior. However, it remains unclear where, how, and in what quantities helium and hydrogen isotopes are present in metals containing bubbles.
In this study, we investigated the gas retention behavior of bubbles in several fusion reactor materials―tungsten, beryllium, and reduced-activation ferritic/martensitic steel (F82H)―using two advanced TEM techniques: (i) in-situ ion irradiation TEM equipped with a high-resolution quadrupole mass spectrometer, and (ii) aberration-corrected scanning TEM combined with electron energy-loss spectroscopy (STEM-EELS).
Quantitative data on hydrogen and helium retention will be presented at the lecture meeting. The results clearly demonstrate the direct influence of helium bubbles on hydrogen isotope retention behavior in metals.
報告人簡介：
MITSUTAKA MIYAMOTO（宮本光貴）
Ph.D. Engineering, Kyushu University, 2004
M.Eng. Kyushu University, 2001
B. Sc. Physics, Kyushu University, 1999
Dr. Miyamoto is a full professor of Department of Material Science, Shimane University. His research topics are in the field of plasma material interactions in future fusion reactors. In particular, he is studying the surface modification of divertor materials exposed to high density mixed plasma and the tritium inventory (storage) therein from the viewpoint of microstructure.
