High temperature deformability and microstructural evolution of Ti–47Al–2Cr–0.2Mo alloy

High temperature deformability and microstructural evolution of Ti–47Al–2Cr–0.2Mo alloy were studied by using a Gleeble-1500 simulated machine at temperature from 1050 °C to 1150 °C with strain rate from 2.5 s−1 to 7.5 s−1 and engineering compressive strain from 20% to 50%. The results indicate that the largest engineering compressive strain of the alloy increases with decreasing strain rate and increasing deformation temperature. It has been shown that the strain rate affects the largest engineering compressive strain of the alloy effectively. High temperature deformation mechanism of Ti–47Al–2Cr–0.2Mo alloy mainly refers to the bending and fracturing of the lamellar structures and dynamic recrystallization (DRX). Electron back scattered diffraction (EBSD) and transmission electron microscopic (TEM) results reveal the DRX mostly occurring at grains boundary and interlamellar spacing at a strain rate of 7.5 s−1 is much finer than that at a strain rate of 2.5 s−1 at 1150 °C.