Interface Bonding Mechanism and Mechanical Behavior of AZ31B/TA2 Composite Plate Cladded by Explosive Welding

Magnesium alloys AZ31B plates and pure titanium TA2 plates were bonded successfully through explosive welding. The microstructure and composition of the interface were examined by optical microscope (OM), scanning electron microscopy (SEM) and energy dispersive spectroscope (EDS). To explore the process of element diffusion between AZ31B and TA2, the composite plates were annealed at different temperatures. Furthermore, the mechanical behavior of the composite plates was evaluated. The results show that straight and wavy interfaces coexist on the bonding area. The element diffusion becomes obvious when heating at 450 and 490 °C for 4 and 8 h. The hardness of AZ31B and TA2 is increased significantly due to the plastic deformation and the strain hardening. The mechanical properties of the composite plates are significantly improved compared with those of base plate AZ31B.