Abstract
Through in-situ TEM observation during 30 keV H2+-He+dual-beam irradiation at 723 K,the reaction and transformation of dislocation loops in pure Mo were investigated,especially for<100>loops.Ir-radiation could directly cause the formation of 1/2<111>loops and<100>loops,but 1/2<111>loops were dominant.In-situ observation confirmed the formation mechanism of<100>loops,including direct irradiation induced mechanism,1/2<111>loop direct conversion mechanism,and reaction mechanism of two 1/2<111>loops.Meanwhile,the reaction of two 1/2<111>loops to produce<100>loop should not require the strict size similarity condition.The reaction between 1/2<111>loops could also pro-duce 1/2<111>loop,which was essentially a process in which one loop absorbed another one.The yield strength increment caused by irradiation-induced loops was analyzed,and its saturation value reached 0.48 GPa at 0.06 dpa.Compared with single He+irradiation,the number density and average diame-ter of loops increased significantly and more serious damage was caused under the synergistic effect of hydrogen and helium.The mechanism based on in-situ experimental observation was discussed in depth.
基金项目
Jinchi Huang and Zhe-hui Zhou from the Xiamen University for the support of ion irra-diation experiments and TEM experiments,res()
National Natural Science Foundation of China(11975191)
National Natural Science Foundation of China(U1832112)
National Natural Science Foundation of China(U1967211)
NETL
NSTL
万方数据