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.

Automated summary

The deformation temperature and strain rate influenced the deformation mechanism and texture formation of the metastable beta-titanium alloy Ti5321 during hot-compression. Decreasing Zener-Hollomon parameter Z led to a shift towards dynamic recovery and dynamic recrystallization, resulting in a < 100 > < 111 > double-fiber texture. Dynamic globularization of the alpha-phase and promotion of beta-grain formation by continuous dynamic recrystallization contributed to the flow softening behavior of Ti5321.