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

Highlights: • Zener-Hollomon parameter (Z) affects deformation mechanism and texture formation. • The volume fraction of < 111>fiber increases with increasing Z in the β-phase field. • Activation energy is 240 kJ/mol and 370 kJ/mol in the β- and (α + β)-phase field. • Dynamic recrystallization of β-grains could affect the flow softening behavior. -- Abstract: 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 β-titanium alloy Ti5321 across the β-transus temperature during hot-compression was investigated by electron backscatter diffraction. In the β-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 β- and (α + β)-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 α-phase and promotion of β-grain formation by continuous dynamic recrystallization.