Mo-Nb单晶的热变形行为及本构方程

Isothermal compression of the Mo-Nb single crystals was conducted on a Gleeble-3800 thermal simulator in the deformation temperature range of 1100-1300℃ with strain rates from 0.001 to 10 s^-1, height reduction of 50%, and true strain 0.7. The results show that the deformation temperature and strain rates affect the flow stress during the thermal deformation of Mo-Nb single crystals significantly. The true stress-strain curves exhibit a peak flow stress, flow softening and steady flow behavior. The constants of Mo-Nb single crystals, such as the activation energy Q, and the stress exponent n, were calculated. The constitutive equation was established based on hyperbolic-sine equations of Arrhenius type.