Effect of niobium content on irradiation microstructure and hardening in FeCrAl-based alloys

作     者：Xiong Zhou Hui Wang Liping Guo Yiheng Chen Fang Li Yunxiang Long Cheng Chen Ziyang Xie Hongtai Luo Shaobo Mo Xiong Zhou;Hui Wang;Liping Guo;Yiheng Chen;Fang Li;Yunxiang Long;Cheng Chen;Ziyang Xie;Hongtai Luo;Shaobo Mo

作者机构：Hubei Nuclear Solid Physics Key LaboratoryKey Laboratory of Artificial Micro-and Nano-Structures of Ministry of Education and School of Physics and TechnologyWuhan UniversityWuhan 430072China Science and Technology on Reactor Fuel and Materials LaboratoryNuclear Power Institute of ChinaChengdu 610041China School of Mechanical EngineeringChengdu UniversityChengdu 610106China Analysis and Testing Center of Wuhan UniversityWuhan UniversityWuhan 430072China 

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

年 卷 期：2021年第95卷第36期

页      面：181-192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 the National Natural Science Foundation of China(Nos.51971207 11975170 and 51801194) 

主　　题：FeCrAl alloy Dislocation loops Radiation damage Accident tolerant fuel cladding Laves phase 

摘      要：Iron-chromium-aluminum(FeCrAl)alloys with different content of niobium(Nb)—0,0.4 wt%,0.8 wt%,and 1.2 wt%—were designed and *** samples were then irradiated with 2.4 MeV Fe^(2+)ion to the dose of 1 and 15 displacements per atom(dpa)at 400℃.The formations of dislocation loops induced by self-ion irradiation in these alloys were investigated by transmission electron microscopy(TEM).Nano-indentation tests were used to assess the hardness and irradiation hardening of *** the samples before irradiation,the(Fe,Cr)_(2)(Nb,Mo)Laves phases density and the nano-indentation hardness increased with increasing Nb content of the *** irradiation to 1 and 15 dpa,both of a/2and adislocation loops were produced but no voids orα’phase were found in all *** increasing Nb content of the samples,the size of dislocation loops increased first and then decreased,while the total volume number density decreased and then *** fraction of adislocation loops increased first and then decreased with increasing Nb content,and increased with increasing irradiation *** networks and the amorphization of the Laves phases were observed in the samples with irradiation dose of 15 *** hardening of Nb free samples was two to four times that of Nb containing samples,and the irradiation hardening increased with increasing Nb content of Nb containing *** experimental results indicate that the increase of Nb content in Fe Cr Al alloys can increase the density of Laves phases,leading to the decrease of Mo content and increase of Cr content in the *** competition between the two types of solutes affects the nucleation and growth of the dislocation loops.