In-situ TEM investigation on the evolution of He bubbles and dislocation loops in Ni-based alloy irradiated by H_(2)^(+)&He^(+)dual-beam ions

作     者：Zhenbo Zhu Weichi Ji Hefei Huang Zhenbo Zhu;Weichi Ji;Hefei Huang

作者机构：Shanghai Institute of Applied PhysicsChinese Academy of SciencesShanghai 201800China School of Nuclear Science and TechnologyUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2023年第138卷第7期

页      面：36-49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：This work was financially supported by the National Natural Science Foundation of China(Nos.12022515 and 11975304) the Youth Innovation Promotion Association,Chinese Academy of Sciences(No.Y202063).The authors would like to thank the assis-tance of the Xiamen Multiple Ion Beam In-situ TEM Analysis Facility 

主　　题：In-situ TEM observation Ni-based alloy Dislocation loop Punching loop Bubble-loop complex 

摘      要：The synergistic evolution mechanisms of He bubbles and dislocation loops under 30 keV H_(2)^(+)&He^(+)dual-beam ions irradiation at 650℃ in the Ni-based alloy GH3535,which is the most promising candidate structure material for molten salt reactors(MSRs),were revealed via in-situ *** nucleation,merg-ing,and change in the size of the dislocation loops and He bubbles were characterized in detail to study the influences of irradiation fluence and pre-existing dislocation loops on their *** number density of both the He bubbles and dislocation loops increases rapidly and subsequently saturates,whereas their size continuously increases with the increasing ion ***-existing dislocation loops with strong absorption characteristics grow preferentially and suppress the nucleation of dislocation loops during the dual-beam ions ***,the bubbles tend to nucleate within the dislocation loops to form bubble-loop complexes,and then decrease in their number *** details of the un-faulting processes of the Frank loops were discussed,where the energy difference between the two types of loops as well as the evolution of the inside Shockley dislocation loops dominates the unfaulting *** several evolution stages of the loop-punching mechanism are revealed,and the emitted loops can directly form perfect loops as well as unfault the neighboring Frank *** He bubbles inside the loops provide corresponding stress for the formation of rhombic loops,which can achieve rapid growth and sweep ability by merging with the neighboring ***,its dissociation to Shockley dis-location can unfault the Frank loops along their slip *** the four Frank loop variations,the edge-on Frank loop variations have the highest growth rate,followed by the perfect *** related mechanisms based on in-situ experimental observation are discussed in depth.