文献类型：期刊文献

英文题名：Study on Microstructure of Fiber Laser Welding of CoCrCuFeNi High Entropy Alloy

作者：Li, Juan Zhao, Honglong Zhou, Nian Zhang, Yingzhe Qin, Qingdong Wang, Daoyi Jiao, Jianguo Tang, Guoli Li, Yonghua

第一作者：黎佳

通信作者：Zhao, HL[1];Qin, QD[1]

机构：[1]Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China;[2]2011 Special Funct Mat Collaborat Innovat Ctr Guiz, Guiyang 550003, Peoples R China;[3]Guizhou Coll & Univ Proc Ind New Proc Engn Res Ctr, Guiyang 550003, Peoples R China;[4]Guizhou Hangrui Aviat Precis Parts Mfg Co Ltd, Zhunyi 563000, Peoples R China

第一机构：贵州理工学院

通信机构：corresponding author), Guizhou Inst Technol, Key Lab Light Met Mat Proc Technol Guizhou Prov, Guiyang 550003, Peoples R China.|贵州理工学院;

年份：2022

卷号：15

期号：24

外文期刊名：MATERIALS

收录：;EI(收录号：20225313323595);Scopus(收录号：2-s2.0-85144827749);WOS:【SCI-EXPANDED(收录号:WOS:000904559200001)】；

基金：This work was supported by the National Natural Science Foundation of China under Grant (No. 51964011); Guizhou Province Science and Technology Planning Project, under Grant [No. Qianke He Jichu ZK(2022) Yiban 175]; Guizhou Province High Level Innovative Talents [No. Qianke He Platform and Talent (2022)011-1]; Education Department Youth Science and Technology Talent Growth Project of Guizhou Province [No. Qian Jiao He KY (2022) 342]; Guizhou Colleges and Universities Process Industry New Process Engineering Research Center [No. QianJiaoJi (2022)034]; Key Laboratory of Light Metal Materials Processing of Guizhou Province [No. Qian Ke He Platform and talent (2016) 5104].

语种：英文

外文关键词：high-entropy alloy; optical fiber laser welding; microstructure; mechanical properties

摘要：A CoCrCuFeNi high-entropy alloy was successfully welded in this study using fiber laser welding. The effects of the welding parameters on the microstructure and mechanical properties were studied. Three zones were formed: the fusion zone, partial melting zone, and base metal. The base metal exhibited a typical dendrite structure, and the Cu element segregated in the interdendrite. The fusion zone consisted of fine equiaxed crystals and columnar crystals with the same crystalline structure as the base metal. The fusion zone exhibited minimal compositional microsegregation after laser welding. Electron backscatter diffraction results showed that the low-angle grain boundary fraction in the fusion zone increased. Furthermore, some dislocations and dislocation pile-ups were present in the fusion zone, and the densities of the dislocations and dislocation pile-ups were higher than those of the base metal. The hardness of the fusion zone was considerably higher than that of the base metal, while the ultimate tensile strength and elongation values were lower than those of the base metal for all conditions. The ultimate tensile strength and the elongation increased gradually and then decreased with increasing laser power. The maximum ultimate tensile strength exceeded that of the base metal by 90%.