Development of constitutive relationships for the hot deformation of boron microalloying TiAlCrV alloys

Isothermal compressive tests are performed on TiAlCrV and TiAlCrV+B alloys to study hot deformation behavior. A hyperbolic-sine Arrhenius-type equation is used to derive the constitutive equation to correlate the flow stress to the deformation temperature, and the strain rate to strain level. The results show that all experimental data of TiAlCrV and TiAlCrV+B alloys can be fully described using this hyperbolic-sine Arrhenius-type relationship. The activation energy, Q, the material constants, n and ln nA, of both alloys decrease as the deformation strain increases. The strain dependent term is successfully incorporated in the constitutive equation through the parameters, Q, n, and ln A. The preliminary results also suggest that the constitutive relationship between the flow stress and strain and between the strain rate and temperature can be used to predict the hot-workability map for the hot deformation of intermetallic alloys.