Evolution of helium bubbles in FeCoNiCr-based high-entropy alloys containing γ′ nanoprecipitates

作     者：冯婷 蒋胜明 胡潇天 张子骏 黄子敬 董士刚 张建 Ting Feng;Sheng-Ming Jiang;Xiao-Tian Hu;Zi-Jun Zhang;Zi-Jing Huang;Shi-Gang Dong;Jian Zhang

作者机构：College of EnergyXiamen UniversityXiamen 361005China16 

出 版 物：《Chinese Physics B》 (中国物理B（英文版）)

年 卷 期：2024年第33卷第7期

页      面：491-500页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 082701[工学-核能科学与工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 0827[工学-核科学与技术] 

基　　金：Project support provided by the National Natural Science Foundation of China(Grant No.12075200) the National Key Research and Development Program of China(Grant No.2022YFB3706004) 

主　　题：high-entropy alloys irradiation resistance coherent precipitates helium bubbles 

摘      要：A series of high-entropy alloys(HEAs) containing nanoprecipitates of varying sizes is successfully prepared by a non-consuming vacuum arc melting *** order to study the irradiation evolution of helium bubbles in the FeCoNiCrbased HE As with γ precipitates,these samples are irradiated by 100-keV helium ions with a fluence of 5 × 10^(20) ions/m^(2) at 293 K and 673 K,*** the samples irradiated at room temperature are annealed at different temperatures to examine the diffusion behavior of helium *** electron microscope(TEM) is employed to characterize the structural morphology of precipitated nanoparticles and the evolution of helium *** results reveal that nanosized,spherical,dispersed,coherent,and ordered L1_(2)-type Ni_(3)Ti γ precipitations are introduced into FeCoNiCr(Ni_(3)Ti)_(0.1) HEAs by means of ageing treatments at temperatures between 1073 K and 1123 *** the ageing treatment conditions adopted in this work,γ nanoparticles are precipitated in FeCoNiCr(Ni_(3)Ti)_(0.1) HE As,with average diameters of 15.80 nm,37.09 nm,and 62.50 nm,*** average sizes of helium bubbles observed in samples after 673-K irradiation are 1.46 nm,1.65 nm,and 1.58 nm,*** improvement in the irradiation resistance of FeCoNiCr(Ni_(3)Ti)_(0.1) HEAs is evidenced by the diminution in bubbles ***,the FeCoNiCr(Ni_(3)Ti)_(0.1) HEAs containing γ precipitates of 15.8 nm exhibits the minimum size and density of helium bubbles,which can be ascribed to the considerable helium trapping effects of heterogeneous coherent phase ***,annealing experiments conducted after 293-K irradiation indicate that HEAs containing precipitated phases exhibits smaller apparent activation energy(E_(a)) for helium bubbles,resulting in larger helium bubble *** study provides guidance for improving the irradiation resistance of L1_(2)-strengthened high-entropy alloy.