Abstract:The hot deformation behavior of Ti-6Al-4V-0.1Ru titanium alloy was investigated by isothermal compression tests on a Gleeble-3500 thermal simulator over deformation temperature range of 1023-1423 K and strain rate of 0.01-10 s^-1. Arrhenius-type constitutive models were developed for temperature ranges of both α+β dual phase and β single phase at strain of 0.1. Afterwards, a series of material constants (including activation energy Q, material constants n, α and ln A) as polynomial functions of strain were introduced into Arrhenius-type models. Finally, the improved Arrhenius-type models in temperature field of α+β and β phase were constructed. The results show that the improved Arrhenius-type models contribute to the calculation of Zener-Hollomon (Z) parameter, and the microstructural evolution mechanism is uncovered by combining microstructure observations with Z-parameter. Furthermore, the improved Arrhenius-type models are also helpful to improve the accuracy of finite element method (FEM) simulation in the deformation process of Ti-6Al-4V-0.1Ru titanium alloy.

Key words: Ti-6Al-4V-0.1Ru titanium alloy; Arrhenius-type constitutive model; Zener-Hollomon parameter; microstructural evolution; FEM simulation