The Research on the Dynamic Damage Constitutive Model Parameters of the Novel TiZrNbVAl Refractory High-Entropy Alloy under Impact Conditions

Abstract

High-entropy alloys have been widely applied in various fields such as medicine and national defense due to their unique properties. In order to further explore the potential applications of high-entropy alloys in the military field, a high-strength, high-toughness refractory high-entropy alloy (Ti₂Zr)_1.5NbVAl_0.5 was prepared using the vacuum arc melting method. The initial phase analysis of the alloy was conducted using scanning electron microscopy (SEM) and x-ray diffraction (XRD), indicating that the prepared alloy is a single-phase BCC high-entropy alloy rich in aluminum and zirconium elements. Subsequent mechanical performance tests were conducted, including quasi-static compression and tension tests, dynamic compression at room temperature, and dynamic compression experiments at high and low temperatures (400 °C to − 80 °C). Based on the experimental data, the parameters of the Johnson–Cook constitutive model and damage model were calibrated and obtained. Finally, the obtained parameters were validated through ballistic impact tests and numerical simulations, which showed a high degree of consistency between the two, thus confirming the accuracy of the obtained parameters. This also indicates that the Johnson–Cook constitutive model can be employed to predict the mechanical response of the (Ti₂Zr)_1.5NbVAl_0.5 high-entropy alloy under impact conditions.