Investigation on recrystallization behavior of Ti-47Al-1.5Re-X (Cr, Mn, V, Nb) alloy during hot deformation

Abstract

The recrystallization behaviors of TiAl alloy play major roles in the microstructure control during the thermal–mechanical treatment, affected intensively by alloy composition. Hence, the effect of alloy elements (Cr, Mn, V, Nb) on the recrystallization of Ti-47Al-1.5Re-X alloy was investigated by thermal simulation compression. Cr and V could increase the DRX critical strain. Mn and Nb could broaden the lamellar spacing, and promote the onset of dynamic recrystallization (DRX). Meanwhile, the DRX kinetics was dramatically slowed by adding alloy elements, while Mn caused the least negative effect. Additionally, Cr, Mn, and V were demonstrated to expedite the SRX/MDRX kinetics by a qualitative analysis method, while Nb resulted in the opposite effect. Eventually, the comprehensive deformation performance was discussed, summarizing that Ti-47Al-1.5Re-2Mn alloy is the optimal deformed TiAl alloy.