Tensile fracture mechanism and constitutive models of V-5Cr-5Ti alloy under different strain rate deformation at room temperature

• The tensile properties of V-5Cr-5Ti alloy under different strain rates were tested.
• The effect of strain rate on the fracture mechanisms of V-5Cr-5Ti were analyzed.
• The precisions of four different constitutive models were accessed.

The mechanical properties of V-5Cr-5Ti alloy were tested over the strain rate range of 10−4–10−1/s at room temperature, and the effect of strain rates on the fracture mechanisms was studied through the fracture surface analysis. The results show that the coalescence of intergranular microcracks and dimple rupture is the dominant fracture mechanism. Brittle fracture often occurred under the high strain rate deformation. Four different constitutive models were used to characterize the mechanical properties of V-5Cr-5Ti alloy. Their precisions were assessed by comparing the model predictions with the experimental results under different strain rates and a strain rate jump test.