Evidence of Homogeneous Microstructures in Ti6Al4V Alloy During Shear Deformation

Abstract

Free-end torsion tests were conducted for Ti6Al4V (Ti64) alloy at temperatures of 298 K, 673 K, and 873 K for different strains ranging from 0.22 to 0.99. The microstructure and texture evolution as a function of torsional deformation have been investigated in the present study. A near-equiaxed homogeneous microstructure was observed after deformation at all temperatures. However, the grains were observed to be aligned along the direction of shear stress at larger deformation strains. Dynamically recrystallized (DRX) grains were observed in the samples at higher deformation temperatures, and these were found to be significant at 873 K for strains > 0.66. Dynamic transformation of ? ? ? was also observed during deformation at a temperature of 873 K. The initial fiber texture got rotated toward the ideal B fiber orientation, and reached at the ideal C2 fiber orientation after deformation for a maximum strain of 0.99. The deformation texture was further simulated through the Visco plastic self-consistent (VPSC) method, and it was found that the basal slip was the dominant deformation mode followed by prismatic and both pyramidal <c+a> I and II slip systems. The flow stress decreased with increase in the temperature of deformation, and a significant flow softening was observed during deformation at 873 K. � 2022, The Minerals, Metals & Materials Society and ASM International.