Abstract
Constitutive models are widely used to predict the mechanical behavior of materials. In this research, the Johnson-Cook (J-C) constitutive model parameters of Ti-6Al-4V (Ti64) alloy with different microstructural details were fitted based on the mechanical properties over a broad range of strain rates and temperatures. The results indicate that the microstructural details have a significant effect on the mechanical properties and the J-C model parameters of Ti64. The five material parameters (A, B, n, C, m) in J-C model of Ti64 exhibit completely different varying trends as a function of the equiaxed primary α-phase volume fraction and α-platelet thickness. These changes in J-C model parameters of Ti64 can be attributed to the effect of microstructural details on the dislocation nucleation and motion under different deformation conditions.
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