Effect of Friction Pressure on ZK60/Ti Joints Formed by Inertia Friction Welding

The ZK60 Mg-based alloy (Mg-Zn-Zr alloy) and pure Ti were welded by inertial friction welding under friction pressures from 15 to 60 MPa. The mechanical properties and microstructures of the joints were investigated. The results show that the tensile strength of the welding joints increased with increasing friction pressure. When the friction pressure reached 60 MPa, a maximum tensile strength of 177 MPa was measured, which was around 58% of the strength of the Mg alloy base metal. Fractures occurred at the interfaces of the joints. A thin layer rich in Zn and Zr was formed at the joint interface, which affected the tensile strength of the dissimilar ZK60 and Ti joint.