Effect of temperature and strain rate on the deformation behavior of Ti5321 during hot-compression

The effect of deformation temperature and strain rate (collectively described by the Zener-Hollomon parameter Z) on the deformation mechanism and texture formation of the metastable beta-titanium alloy Ti5321 across the beta-transus temperature during hot-compression was investigated by electron backscatter diffraction. In the beta-phase field, it is found that the deformation behavior and texture formation varies depending on Z. With decreasing Z dynamic recovery and dynamic recrystallization become more and more important. The activation energy for steady state deformation is 240 kJ/mol and 370 kJ/mol in the beta- and (alpha + beta)-phase field, respectively. The texture developed is a < 100 > < 111 > double-fiber with < 100 > dominating at all deformation conditions. The < 111 > fiber gets more prominent with increasing Z suggesting that it is mainly related to deformation. Flow softening behavior of Ti5321 is associated with dynamic globularization of the alpha-phase and promotion of beta-grain formation by continuous dynamic recrystallization. (C) 2021 Elsevier B.V. All rights reserved.