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Effect of Diffusion-Temperature on Microstructure and Mechanical Properties of Diffusion-Bonded TC4/Al Thin Film/1060 Al Joints

Diffusion bonded joints of Ti alloys and Al alloys are widely applied in chemical, nuclear, aerospace industries. In the present study, TC4/Al thin film/1060 Al joints were bonded successfully by means of diffusion bonding under low temperature. The microstructure and mechanical properties of the joints were investigated by SEM,XRD and shear strength test. The results showed that the highest shear strength of TC4/Al thin film/1060 Al joints was 80.2 MPa. With the increasing of temperature, the shear strength increases firstly and then almost remains the same. Ti and Al elements diffused to each other in the bonding process and the intermetallic compounds can’t be found. The fracture of the joint had taken place in the 1060 Al/Al thin film rather than in the TC4/Al thin film and the fracture way of the joints was ductile fracture.