Deformation behavior of high Nb containing TiAl based alloy in α plus γ two phase field region

Hot deformation behavior of high Nb containing TiAl based alloy with a nominal composition of Ti-44Al-8Nb-0.2W-0.2B-0.1Y at 1225 degrees C and 1275 degrees C is investigated. The deformation mechanism of alpha phase is dynamic recovery at 1275 degrees C, whereas gamma phase ismainly dynamic recrystallized. It is revealed that alpha phase is softer and easier to be deformed when the alloy is deformed at 1275 degrees C. The reasons of the different deformation behavior between 1225 degrees C and 1275 degrees C, as well as the different deformation behavior between alpha phase and gamma phase are analyzed. A multistep deformation process at gradually lowered temperature is proposed to eliminate the adverse influence of remnant lamellar structure on mechanical properties. (C) 2015 Elsevier Ltd. All rights reserved.