Microstructure and properties of Ti/Al composites materials fabricated by wire and arc additive manufacturing

In this paper, Al/Ti composite materials were fabricated by wire and arc additive manufacturing based on cold metal transfer. The elements diffusion and a certain thickness of intermediate reaction layer were observed in the interface, which indicates that the Ti and Al were well bonded. At the same time, the hardness of the interface was between the titanium side and the aluminum side, which is mainly due to the formation of hard and brittle intermetallic compounds in the intermediate reaction layer. Considering that different clad ratio would lead to different mechanical properties, the effect of clad ratio on the tensile mechanical properties of notched Ti/Al composite materials was studied through tensile test. The results show that the two layers of Ti/Al composite materials interacted with each other under continuous tensile load. With the increase of the clad ratio, the tensile strength and yield strength increased, but the elongation first decreased and then increased, which is related to the mechanical properties of the deposited titanium and aluminum. In addition, ABAQUS was used to supplement the tensile process of Ti/Al composite materials with various clad ratios, and the equations between clad ratio and yield strength and tensile strength were obtained.