| Abstract: | The isothermal compression dynamics of ternary Ti-6 Al-4 V alloy with initial martensitic structures were investigated in the high temperature range 1083-1173 K and moderate strain rate regime 0.01-10 s~(-1).Shear banding was found to still dominate the deformation mechanism of this process,despite its nonadiabatic feature.The constitutive equation was derived with the aid of Zener-Hollomon parameter,which predicted the apparent activation energy as 534.39 kJ/mol.A combination of higher deformation temperature and lower strain rate suppressed the peak flow stress and promoted the evolution of shear bands.Both experiments and calculations demonstrated that a conspicuous temperature rise up to 83 K could be induced by severe plastic deformation.This facilitated the dynamic recrystallization of deformed martensites,as evidenced by the measured microhardness profiles across shear bands. |
