Flow behavior and microstructure evolution of PM Ti-5553 alloy during 0.1 s${}^{-1}$ hot deformation

The hot deformation behavior of powder metallurgy Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloy was investigated by isothermal compression test at the wide temperature range of $700$–$1150^{\circ }$C, under an intermediate strain rate of 0.1 s${}^{-1}$, and with the sample deformation degree of 30%, 50% and 70%. Results suggested that the flow stress was very sensitive to the deformation variables and it decreased with increasing the deformation temperature. Flow localization occurred when the temperature was lower than $800^{\circ }$C, accompanied by the dynamic morphology changing of $\alpha$ phase. Dynamic recovery (DRV) features appeared when the temperature was over $850^{\circ }$C, while dynamic recrystallization (DRX) took a more important role than DRV for the alloy compressed at $900$–$1000^{\circ }$C.