Abstract:In order to solve the problem of forming difficulty of TiAl alloy, Ti-47Al alloy was sintered by Micro-FAST using Ti and Al element powders as raw materials. The effects of temperatures (700~1050 °C) on the microstructures and properties of TiAl alloy were studied, and the migration mechanisms of particles during sintering were investigated. The results show that typical microstructures can’t be formed during sintering at 700°C, and the main phase was TiAl3. When sintering at 800°C and above, the island structure was formed, and the Ti-47Al alloy was mainly composed of TiAl and a small amount of Ti3Al. It has the best comprehensive mechanical properties when sintered at 1050°C. The sintering process was controlled by a variety of diffusion mechanisms. As the holding time increases, evaporation condensation, volume diffusion, grain boundary diffusion and surface diffusion occurred in sequence.