High Frequency Pulse Current Assisted One-step Rolling-welding Fabrication and Interfacial Bonding Mechanism of Magnesium/Aluminum Alloy Composite Plates

In order to solve the problems that poor coordinated deformation of the dissimilar composite metal with large rolling reduction, difficulty in removing the interfacial oxide film and controlling the formation of intermetallic compounds（IMCs） in the fabrication process of Magnesium/Aluminum alloy composite plate by traditional hot rolling, a new method of rolling-welding process assisted by high-frequency pulse current is proposed for preparing magnesium/aluminum alloy composite plates. The interfacial morphologies and bonding strength of the composite plate are investigated under pulse current of 30 kHz, 400 A and 50%duty cycle that was loaded for 120 s with the different rolling reduction parameters. The results show that the shear strength of composite plate is the highest and up to 27.87 MPa when the rolling reduction is 16.8%. In addition, different degrees of molten liquid metals are extruded at the bonding interface in various rolling reduction. The IMCs transition layer is thick and reaches to 7.8 μm,