ABSTRACT
Fatigue is a leading cause of structural material failure and as such has motivated fatigue-resistant design to eliminate inherent risks to human lives. Intrinsic microstructural features alter deformation mechanisms so profoundly that fatigue properties of structural materials become deviant. With this in mind, we reviewed the microstructural effect on fatigue behavior of various high entropy alloys as an adjunct to the fatigue properties of multiple high entropy alloys that to date have been investigated. Therefore, the current review aims to emphasize the fatigue response of HEAs to various microstructural features, e.g., the presence of inclusions and multiple phases, the formation of mechanical twins during deformation, and a metastable matrix with deformation-induced phase transformation. Further, various deformation mechanisms can be activated by altering alloy composition and the alloy processing path. These experimental observations have encouraged us to focus on specific microstructural features that could be implemented into the subsequent design of a fatigue-resistant alloy. Thus, in this review, we address the effect of various microstructural features on the fatigue behavior of high entropy alloys.
