Influence of temperature on microstructure and properties of C_f/Al and TiAl SHS joint

C_f/Al composite was joined to TiAl alloy by SHS process in a vacuum furnace with 14Al-2Ni-3CuO interlayer. On TiAl side, TiAl₃ layer formed in the interface; on C_f/Al side, NiAl₃ generated in the interface. Within C_f /Al, NiAl₃ was also produced due to the diffusion of Ni from the interlayer. The joining temperature greatly affected the microstructure and mechanical properties of the resultant joints. With the increasing of joining temperature, the TiAl₃ layer in the interface became thicker and the mechanical properties of the joints increased obviously, and the shear strength of joints reached 26.9MPa at 550°C. However, when the joining temperature exceeded 600°C, the shear strength descended rapidly. When the joining temperature was low, the fracture mostly happened on TiAl side. While the joining temperature became higher, the fracture generally occurred on C_f/Al side.