异种铝合金搅拌摩擦焊接头微观组织与力学性能研究  

Microstructure and Mechanical Properties of Friction Stir Welded Dissimilar Aluminum Alloys

作　　者：姚刘超 吴俊杰 谈茁宇 欧文敏 郭国林 邹琳 田露苗 YAO Liuchao;WU Junjie;TAN Zhuoyu;OU Wenmin;GUO Guolin;ZOU Lin;TIAN Lumiao(School of Automotive Engineering,Changshu Institute of Technology,Changshu 215500;Organization Department of Yinjiang Tujia and Miao Autonomous County Committee,Tongren 554300,China)

机构地区：[1]常熟理工学院汽车工程学院,江苏常熟215500 [2]中共印江土家族苗族自治县委组织部,贵州铜仁554300

出　　处：《常熟理工学院学报》2025年第2期115-119,共5页Journal of Changshu Institute of Technology

基　　金：常熟理工学院大学生创新创业训练计划项目“异种铝合金搅拌摩擦焊接头微观组织与力学性能关系”(XJDC2023063)。

摘　　要：为研究7050和7075异种铝合金在搅拌头不同转速下微观组织与力学性能,设置5组转速进行焊接实验,其搅拌头转速参数分别为1000 r/min,1200 r/min,1400 r/min,1600 r/min,1800 r/min.分析拉伸试验后的宏观形貌和焊缝横断面金相组织的变化.结果表明:随着转速的提升,转速越大焊核区晶粒越细,经再结晶后的细化晶粒分布越均匀,转速为1400 r/min和1800 r/min接头的拉伸性能较好,1400 r/min转速下接头完整,是本次实验范围内最优的焊接工艺参数.采用EBSD对比分析了焊核区和母材的微观组织,初步验证了焊核区动态再结晶理论.In order to obtain the relationship between microstructure and mechanical properties of 7050/7075 dissimilar aluminum alloys at different rotated speeds,five groups of rotated speeds were set for welding experiments in this study.The rotated speeds of the welding tool were 1000 r/min,1200 r/min,1400 r/min,1600 r/min,1800 r/min.The microstructure of the weld cross-section and metallographic structure after the tensile experiment were compared.The results show that the speedier the increase of the rotation is,the finer the grains in the weld nugget zone are,and the more uniform the distribution of refined grains is after recrystallization.The joints at 1400 r/min and 1800 r/min have better tensile properties.The joint remains defect-free at 1400 r/min,which is the best welding process parameter in this experiment.The microstructure of nugget zone and base metal was comparatively analyzed through EBSD experiments,and the dynamic recrystallization theory of nugget zone was preliminarily verified.

关 键 词：异种铝合金 搅拌摩擦焊 转速 微观组织 力学性能 

分 类 号：TG456.9[金属学及工艺—焊接]