Experimental study on diffusion bonding in pure magnesium

Abstract

Applicability of diffusion bonding was examined on pure magnesium rolled sheet with an initial grain size of 85 μm. The diffusion bonding tests were carried out in air at the pressure range from 2 to 20 MPa and at the temperature range from 573 to 673 K and for the times up to 72 h. Before diffusion bonding, the surfaces to be bonded were blasted to make rugged. The post-bonded mechanical properties were estimated by the compression lap shear test, and the microstructure after bonding were also observed by the microscopy in order to achieve the optimal process for diffusion bonding. The maximum of lap shear strength was 0.888 at a bonding pressure of 20 MPa and a bonding temperature of 673 K, with a bonding time of 1 hour. In high ratio of lap shear strengths, the bond line was not identified by optical microscopy, and surface fracture after compression lap shear test was also fully ductile failure. The present results revealed that there is a possibility to fabricate magnesium products using diffusion bonding technique.