Synergistic Fatigue Performance in High Entropy Alloys with Novel Precipitates and Metastable Phases

Recently, a new concept of the alloying-design strategy, called high-entropy alloys (HEAs), has been developed. Unlike traditional alloys based on one element as the principal component, HEAs are designed with four or more principal elements. The HEAs have been regarded as promising alloys with excellent mechanical properties. However, most of the investigations focused on the tensile or compressive behaviors, and the fatigue properties of HEAs are still not well studied. The goal of our proposed research is to investigate the low cycle fatigue behaviors of HEAs and try to explore the stronger HEAs with excellent fatigue resistance by introducing multicomponent nanosized precipitates and phase transformations. The combination of the in-situ diffraction techniques and micromechanical models is used to establish the relationship between macroscopic properties and microstructural mechanisms during low cycle fatigue tests. This investigation could accelerate the engineering applications of HEAs.