Research progress in dynamic mechanical behavior of high-entropy alloys

Abstract

High-entropy alloys exhibit excellent properties such as high strength and toughness, good wear resistance, superb corrosion resistance and superior high-temperature oxidation resistance, which have good potential applications in terms of energy chemical industry, aerospace and national defense. The mechanical behavior of high-entropy alloys under the condition of dynamic loading is different from that under the quasi-static loading, presenting higher strength, more twins and adiabatic shear bands and so on. And different phase structures have a significant impact on the dynamic properties and deformation mechanism of high-entropy alloys. Moreover, the high-entropy alloys have a certain research value in the field of energetic structural materials due to their good energy release characteristics under the condition of dynamic loading. Usually, the stability of dynamic experiment is unacceptable and the test is also difficult to achieve. In contrast, the dynamic mechanical properties of high-entropy alloys can be well predicted based on the constitutive models with experimental verification. As above-mentioned analysis, the dynamic mechanical behavior of high-entropy alloys with different phase structures, energy release characteristics and constitutive models were reviewed. Meanwhile, the comprehensive properties and their constitutive models as well as the simulation calculations were prospected. Finally, it is pointed out that the dynamic mechanical properties of high-entropy alloys can be improved by adjusting the type and proportion of elements, phase structure and concentration distribution. At the same time, the influence mechanism of temperature and strain rate on the dynamic mechanical behavior of high-entropy alloy needs further study. The model calculation also needs to play a greater role in revealing its deformation mechanism and predicting its performance at high strain rate.

Keywords

• high-entropy alloy
• dynamic mechanical behavior
• energy release characteristic
• constitutive model