Abstract: Deformation behavior and microstructure evolution of the TC11 titanium alloy at high temperatures were investigated. The results show that the flow stress of the alloy decreases as the deformation temperature increases and the strain rate decreases during deformation, and the degree of softening of the flow stress increases as the strain rate increases. By analysis of the processing map at true strain of 0.6, the highest energy dissipation rate is found at 940 ℃ and 0.001 s^-1 and reaching 0.71. The plastic instability zone is found in the range of 920-930 ℃ and 0.9-10 s^-1. The dynamic recrystallization of the α-phase during hot deformation of the TC11 titanium alloy is promoted by increase of the strain rate, the deformation volume and the deformation temperature.

Key words: TC11 titanium alloy, hot deformation behavior, processing map, microstructure