LAUSR

Abstract Magnesium alloys with Ag-Cu interlayer were joined by ultrasonic-induced transient liquid phase bonding. The influence of ultrasonic vibration time was studied. The mechanical properties of joints at room temperature and higher temperature were measured. With ultrasonic vibration time increasing, the ternary eutectic reaction between base metal and interlayer formed eutectic liquid phase. Mg element gradually diffused toward the center of weld, the liquid phase increased, and then the width of weld widen, substances such as solid solution α-Mg, AgMg3, CuMg2 were observed in weld. The weld was gradually closed with the extrusion of liquid phase and the diffusion of elements. At room temperature, the shear strength of joints could reach to ∼92 MPa, and the fracture partly occurred in base metal. The shear strength of nearly closed joints increased with temperature decreased from 300 °C to room temperature.