Deformation Behavior and Constitutive Model for Isothermal Compression of TC4 Alloy
The uniaxial hot compression deformation behaviors of TC4 alloy are investigated by a Gleeble-1500D thermo-physical simulator at the temperatures of 750–950 °C and at the strain rates of 0.01–10.0 s−1. The results show that the curves of the true stress–strain exhibit a typical dynamic recrystallization process. The Arrhenius equation is employed to predict the flow stress. The entire flow curve is modeled using the equation, whereas there exists large deviation at almost all of the stain rates. To ensure the accuracy of predicted results, a modified Zener–Hollomon parameter (Z′) is introduced. The results show that the modified constitutive equations established in this study could well predict the value of flow stress in the hot deformation of TC4 alloy.
KeywordsTi–6Al–4V alloy Hot compression True stress–strain Constitutive model
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