辐照
氦
位错
材料科学
梁(结构)
放射化学
原子物理学
化学
核物理学
复合材料
物理
光学
作者
Yifan Ding,Ziqi Cao,J. Ren,Dewang Cui,Kun He,Yuanming Li,Guang Ran
标识
DOI:10.1016/j.jnucmat.2023.154637
摘要
In materials exposed to neutron irradiation, helium atoms produced by transmutation reactions are prevalent and play a significant role in the evolution of dislocation loops, causing mechanical property degradation. However, systematic investigation on the helium role is lack and possible origin of helium effects is unclear. Here, by performing 400 keV Fe ion and 30 keV He in-situ irradiation, this study found that about 9.2×1012 cm−3 loops nucleated for every increase of 1 appm He at 0.9 dpa in Fe++He+ dual beam irradiation and 87% loop density was produced with the help of helium at 2262 appm/dpa. The different loop evolution in single He irradiation and Fe++He+ irradiation indicated the presence of high-density TEM-invisible (≤ 2 nm) small loops after Fe+ irradiation at high temperatures. The large number of loops produced by helium irradiation were possibly related with the small bubbles.
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