High temperature deformation mechanism of Ti-40 burn resistant titanium alloy as-annealing

11-40 alloy is a single β phase burn resistant titanium alloy. Its high temperature deformation mechanism and stress-strain (σ-ε) curves were studied by Gleeble-1500 thermal-simulator. The results suggest that there are a bit abrupt flow stress drops followed by steady state in Tï-40 alloy as-annealing. The magnitude of the flow stress drop increases with strain rate and decreases with temperature. Its deformation activation energies are 174 kJ/mol for 650-850°C and 276.7 kJ/mol for 950-1000°C, which are close to or bigger than the values for self and solute lattice diffusion in pure β titanium, there-by, the deformation mechanism at temperature range is controlled by lattice diffusion for 650-850°C, or mainly controlled by dynamic reciystallization for 950-1000°C.