Abstract Scope |
Multi-principal elements alloys with more than five components, namely high-entropy alloys (HEAs) have been extensively studied due to their excellent mechanical properties as promising structural materials. As novel alloys, excellent performances such as high strength at both cryogenic and high-temperature conditions, great resistance toward classic strength-ductility trade off, have been found in recent studies. However, most emphases have been placed to study their mechanical properties subjected to low strain-rate which leads to insufficient understanding of their properties at high strain-rate condition. In the present study, compression tests with varying strain rates and temperatures are performed on split-Hopkinson pressure bar (SHPB) system to establish their microstructure evolution and deformation mechanisms. Here, we report on a novel method to improve dynamic properties by introducing multiple strengthening mechanisms such as microband, martensitic transformation, and forest hardening. |