摘要
High-entropy alloys(HEAs)and medium-entropy alloys(MEAs)have attracted a great deal of attention for developing nuclear materials because of their excellent irradiation tolerance.Herein,formation and evolution of radiation-induced defects in Ni Co Fe MEA and pure Ni are investigated and compared using molecular dynamics simulation.It is observed that the defect recombination rate of ternary Ni Co Fe MEA is higher than that of pure Ni,which is mainly because,in the process of cascade collision,the energy dissipated through atom displacement decreases with increasing the chemical disorder.Consequently,the heat peak phase lasts longer,and the recombination time of the radiation defects(interstitial atoms and vacancies)is likewise longer,with fewer deleterious defects.Moreover,by studying the formation and evolution of dislocation loops in Ni-Co-Fe alloys and Ni,it is found that the stacking fault energy in Ni-Co-Fe decreases as the elemental composition increases,facilitating the formation of ideal stacking fault tetrahedron structures.Hence,these findings shed new light on studying the formation and evolution of radiation-induced defects in MEAs.
作者
稂林
邓辉球
陶家友
杨腾飞
林也平
胡望宇
Lin Lang;Huiqiu Deng;Jiayou Tao;Tengfei Yang;Yeping Lin;Wangyu Hu(Key Laboratory of Hunan Province on Information Photonics and Freespace Optical Communications,School of Physics and Electrical Sciences,Hunan Institute of Science and Technology,Yueyang 414006,China;School of Physics and Electronics,Hunan University,Changsha 410082,China;College of Materials Science and Engineering,Hunan University,Changsha 410082,China)
基金
financially supported by the National Natural Science Foundation of China(Grant No.11775074)
the Science and Technology Program of Hunan Province,China(Grant No.2019TP1014)