Superplastic diffusion bonding of Ni based alloy/γ-TiAl based alloy

The intended bonding alloys of Ni based alloy and γ-TiAl based alloy were treated by laser surface modification, which provided a good structure condition for turning the bonding of dissimilar alloys to the bonding of similar alloys. Microstructures of laser cladding coating on the substrate of Ni based alloy and superplastic diffusion bonding of Ni based alloy with γ-TiAl based alloy at different bonding temperatures were discussed. The results showed that laser surface modification improved shear strength of the bond,and sound bond could be achieved at 900℃ with a pressure of 60MPa for 1h.