Interfacial texture and bonding strength of Cu/Al laminate metal composite fabricated by ultrasonic additive manufacturing

Abstract

Interfacial texture and bonding strength of Cu/Al laminate metal composite fabricated by ultrasonic additive manufacturing (UAM) were investigated by electron backscattered diffraction, transmission electron microscopy and peeling tests. Results show that after the UAM process, Al foils have obvious shear texture or recrystallisation texture components in the region near the interface of Cu/Al, indicating that Al foils are prone to shear deformation during consolidation, which plays an essential role in the bonding formation of the two dissimilar metals. The rougher Cu foil surface produced by direct contact with sonotrode promotes more remarkable shear deformation of the mating Al foil near the interface during the subsequent consolidation pass, which obviously enhances the interfacial bonding strength.