Effect of process parameters on interfacial microstructure and mechanical properties of Al/Cu friction stir lap welding joints  

作　　者：Wang Chenji Liu Song Zhu Hao Cao Zhilong Dong Shaokang 王晨霁;刘松;朱浩;曹志龙;董少康(School of Materials Science and Engineering,Shijiazhuang TIEDAO University,Shijiazhuang 050043,China;Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment,Shijiazhuang 050043,China)

机构地区：[1]School of Materials Science and Engineering,Shijiazhuang TIEDAO University,Shijiazhuang 050043,China [2]Hebei Key Laboratory of Advanced Materials for Transportation Engineering and Environment,Shijiazhuang 050043,China

出　　处：《China Welding》2022年第4期48-58,共11页中国焊接（英文版）

基　　金：supported by the Key project of Education Department of Hebei Province(Grant No.ZD2019102)。

摘　　要：In this study,friction stir lap welding(FSLW)was performed for the welding test of 6061 aluminium alloy and T2 pure copper.The effect of process parameters containing rotation rate and travel speed on interfacial microstructure evolution and mechanical properties of Al/Cu dissimilar joints were explored.The experiments were carried out under the rotation rates of 600,900 and 1200 r/min and with the travel speeds of 30,70 and 100 mm/min.The characteristic of interface transition zones(ITZs)and the species of intermetallic compounds(IMCs)were investigated.The Al/Cu interface showed a layered structure composed of Al-Cu IMCs,which will affect the mechanical property.The layer consisting of Al2Cu was formed at lower heat input,and as heat input increased the Al4Cu9 phase started to form.Excessive heat input will increase the thickness of the interface and raise the brittleness of the joints.The thickness of the IMCs layers changed from0.89μm to 3.96μm as the heat input increased.The maximum value of tensile shear loading of 4.65 kN was obtained at the rotation rate of900 r/min and travel speed of 100 mm/min with the interface thickness of 2.89μm.The fracture mode of the joints was a mix of ductile and brittle fracture.

关 键 词：friction stir lap welding Al/Cu dissimilar welding intermetallic compounds process parameters mechanical properties 

分 类 号：TG453.9[金属学及工艺—焊接]