A Constitutive Relation Based on the Johnson–Cook Model for Ti-22Al-23Nb-2(Mo, Zr) Alloy at Elevated Temperature

Although several schemes have been proposed to modify the classical Johnson–Cook (J-C) model, effect of temperature on flow stress materials at different temperatures has not clarified. In current study, investigate deformation behavior Ti-22Al-23Nb-2(Mo, Zr) alloy temperatures, uniaxial tension experiments were performed both room (RT, 28 °C) and elevated a modified J-C model was developed describe temperature-dependent plastic flow. tensile experiments, Ti2AlNb-based showed continuous work hardening until reaching ultimate strength RT, while an apparent drop appeared in after peak temperature. Moreover, experimental significantly depends testing To correctly variations stresses parameter, S, which represents softening stress, is integrated into model. addition, applicability validity verified by calibration with curves temperatures. On other hand, fractography post-test specimens examined interrupt increased fracture brittleness The constitutive relation based applicable predict alloys