Achieving High‑Quality Aluminum to Copper Dissimilar Metals Joint via Friction Stir Double‑Riveting Welding  

作　　者：Shude Ji Xiao Cui Lin Ma Hua Liu Yingying Zuo Zhiqing Zhang 

机构地区：[1]College of Aerospace Engineering,Shenyang Aerospace University,Shenyang 110136,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第4期552-572,共21页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(Nos.51874201 and 52074184).

摘　　要：In order to achieve a high-quality joining of aluminum(Al)and copper(Cu)dissimilar metals,a new friction stir doubleriveting welding(FSDRW)with a Cu rod as the rivet was proposed,and the rotating tool with a large concave angle shoulder was specially designed.The results showed that under the thermal–mechanical effect of rotating tool,the Cu rod was deformed to be a double riveting heads structure with a Cu anchor at the upper surface of Al plate and an Al anchor above the lap interface of joint,and these two anchors greatly enhanced the mechanical interlocking of Al/Cu joint.The effective bonding interfaces were formed among the double riveting heads structure,the upper Al plate and the lower Cu plate,which contained the Cu/Cu interface and the Al/Cu interface.The Cu/Cu interface without the kissing bond and the Al/Cu interface with the rationally thin AlCu and Al_(2)Cu intermetallic compounds(IMCs)layers were beneficial to heightening the joint tensile shear strength.The maximum tensile shear load of the FSDRW joint achieved 5.52 kN,and the joint under different plunging depths of rotating tool presented a mixed mode of ductile fracture and brittle fracture.This novel FSDRW technique owns the advantages of strong mechanical interlocking and superb metallurgical bonding,and provides a new approach to acquiring a high-quality Al/Cu dissimilar metals joint.

关 键 词：Al/Cu dissimilar metals joint Friction stir double-riveting welding Bonding interface Mechanical interlocking Tensile shear load 

分 类 号：TG453.9[金属学及工艺—焊接]