Microstructure and Mechanical Property of Transient Liquid Phase Bonded Aluminium-Based Metal Matrix Composite Joints

Microstructure and mechanical property of the transient liquid phase bonded aluminium based metal matrix composite joints with Cu,Ag interlayer have be studied by using SEM,XRD and electron tensile testing machine.According to microstructural feature the joint can be divided into the particulate segregation region,the denuded particulate region and the base material region.Microstructure of particulate segregation region mainly consists of alumina particulates and Al alloy matrix with MgAl₂O₄.It also contains Al₂Cu compound in Cu interlayer joints.Bonding temperature,bonding time and interlayer thickness have an obvious effect on the shear strength of the joints.Under the certain condition,the shear strength of the joints with Cu,Ag interlayer is 82 MPa~99 MPa and 86 MPa~109 MPa,respectively.The particulate segregation region is the weakest one during shear testing.Segregation of decreasing alumina particulate favours improving the mechanical property of joints.