Microstructure evolution and mechanical properties of Cu–Al joints by ultrasonic welding

• DOI: 10.1179/1362171814y.0000000218
• Publication Date: 2014-05-26T14:32:19Z
• Authors: J. W. Yang; B. Cao; X. C. He; H. S. Luo
• Keywords: Ultrasonic welding; Cold welding; Lap joint

Dissimilar joints of copper to aluminium were produced by high power ultrasonic welding (USW). The interfacial reaction between and 6061 alloy as a function time was studied. intermetallic compound (IMC) layer is mainly composed CuAl 2 Cu 9 Al 4 . thickness the IMC increases with time. For relatively long (0·7 s) in USW, dendritic solidification microstructure observed local regions, owing occurrence eutectic reaction, α-Al+θ→ L, process. lap shear load (or strength) first then decreases increasing time, failure occurred dominantly at interface. This attributed development