The phase transformation dependence on temperature and strain rate in Ti was studied.

$\{10\overline{1}2\}〈10\overline{1}1〉$ twinning is the primary deformation mode at the first yield.

The fcc-Ti phase is formed inside the twinning region at K ⩾ 380 K or $\dot{\epsilon }$ ⩾ 10⁸ s⁻¹.

The twin nucleation rate increases with the deformation temperature and strain rate.

The deformation mechanism has changed at the higher strain rate ($\dot{\epsilon }$ ⩾ 10⁹ s⁻¹).