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The dissimilar metal of Ti6Al4V and T2 were joined using a butt joint with and without an intermediate layer Ag by friction stir welding. The interfacial Ti–Cu IMCs of both joints are composed of Ti 2 Cu, TiCu and Ti 3 Cu 4 , and the thicknesses are about 1.5 μm and 3 μm, respectively. The intermediate layer Ag can promote the diffusion of Ti to Cu side, and the diffusion of Ti elements plays a dominant role in the formation of Ti–Cu IMCs. The joint with the intermediate layer Ag presents a higher tensile strength, which is about 70% of the Cu base metal. The fracture characteristics of both types of the joints are brittle fracture, but the tensile fracture regions are different.

The microstructure and mechanical properties of titanium/copper welded joint by FSW