In-situ transmission electron microscopy observation of the evolution of dislocation loops and gas bubbles in tungsten during H2+and He+dual-beam irradiation

作     者：Yi-Fan Ding Yi-Peng Li Xin-Yi Liu Guang Ran Xiu-Yin Huang Qing Han Yang Chen Jin-Chi Huang Zhe-Hui Zhou 

作者机构：College of EnergyXiamen UniversityXiamen 361102China Fujian Research Center for Nuclear EngineeringXiamen 361102China 

出 版 物：《Tungsten》 (钨科技（英文）)

年 卷 期：2021年第3卷第4期

页      面：434-447页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：financially supported by National Natural Science Foundation of China (Grant Nos. 11975191  U1832112  and U1967211) 

主　　题：Tungsten H-He dual-beam irradiation In-situ transmission electron microscopy observation Loop 

摘      要：Dislocation loop and gas bubble evolution in tungsten were in-situ investigated under 30 keV H_(2)^(+)and He^(+)dual-beam irra-diation at 973 K and 1173 *** average size and number density of dislocation loops and gas bubbles were obtained as a function of irradiation *** quantitative calculation and analysis of the migration distance of 1/2loops at low irradiation dose indicated that the main mechanism of the formation ofloops should be attributed to the high-density helium cluster inducement mechanism,instead of the 1/2loop reaction mechanism.H2+and He+dual-beam irradiation induced the formation ofloops and 1/2loops,while increasing the irradiation temperature would increaseloop *** percentage ofloops was approximately 18.6%at 973 K and increased to 22.9%at 1173 *** loop reaction between two 1/2loops to form a large-sized 1/2loop was in-situ observed,which induced not only the decrease of the number of 1/2loops but also the significant increase of their ***loops impeded the movement of dislocation line and tended to escape from it instead of being *** the increase of irradiation dose,the yield strength increment(Δ_(σloop))caused by the change of loop size and density increased first and then decreased slightly,while the yield strength increment(Δ_(σbubble))caused by the change of bubble size and density always ***,within the current irradiation dose range,Δ_(σloop)was much larger thanΔ_(σbubble).