超细晶Cu/Al异种材料搅拌摩擦焊组织与性能研究  

Microstructure and Mechanical Properties of Friction Stir Welding Interface of Ultrafine Grained Copper/Aluminum Dissimilar Materials

作　　者：傅成聪 郑钰 郭怡 杨雯 于泓洋 张悦[1] FU Chengcong;ZHENG Yu;GUO Yi;YANG Wen;YU Hongyang;ZHANG Yue(School of Materials Science and Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《铜业工程》2023年第3期32-39,共8页Copper Engineering

基　　金：辽宁省自然科学基金材料联合基金项目(20180510056,20180510056,2021-KF-15-01)资助。

摘　　要：超细晶材料综合性能优异,但组织热稳定性较差,焊接后接头组织容易发生异常长大,使其性能急剧下降。因此,合适的连接工艺对大尺寸超细晶结构件的应用具有重要工程意义。以超细晶铜、粗晶铝以及粗晶铜、粗晶铝作为结构母材,采用热输入量小的搅拌摩擦焊(FSW)工艺进行连接探索,系统观察了铜铝接头组织与性能。结果表明,超细晶铜与铝接头界面处元素互扩散能力较强,形成较多的Al_(4)Cu_(9)金属间化合物;在焊接过程中,当搅拌头转速为1000 r/min,焊接速度为50 mm/min时,粗晶铜与铝接头硬度可达HV 211,超细晶铜与铝焊接接头可获得良好的力学性能。Ultrafine-grained materials generally exhibit excellent comprehensive properties but low thermal stability.The joint structure after welding is susceptible to abnormal growth,leading to a steep drop in its properties.Thus,suitable joining technology is of great engineering significance for large ultrafine-grained structural components.In this study,ultra-fine-grained copper,coarse grained aluminum,and coarse-grained copper,coarse grained aluminum was used as the structural base materials.The friction stir welding(FSW)process with low heat input was used to explore the joining.The microstructure and properties of copper aluminum joints were systematically observed.The results showed that the strong interdiffusion between ultrafine-grained copper and aluminum at the interface,resulting in the formation of more Al_(4)Cu_(9) intermetallic compounds.Under a rotating speed of n=1000 r/min and welding speed of v=50 mm/min,the coarse-grained copper-aluminum joint achieved a hardness of HV 211,while the ultrafine-grained copper-aluminum welded joint demonstrated good mechanical properties.

关 键 词：超细晶材料 搅拌摩擦焊 显微组织 力学性能 

分 类 号：TG456.9[金属学及工艺—焊接]