Fatigue Crack Growth at Different Frequencies and Temperatures in an Fe-based Metastable High-entropy Alloy

In this study, the fatigue crack growth behaviors of Fe30Mn10Cr10Co (at%) metastable high-entropy alloy at different frequencies and test temperatures were evaluated by compact tension tests. The fatigue crack growth rate did not significantly change with varying frequency. However, it increased with decreasing temperature from room temperature (RT) to 103 K owing to the promotion of the hexagonal close-packed (HCP) martensite-related cracking. Increasing the test temperature from RT to 373 K decelerated the fatigue crack growth rate perhaps owing to the formation of the ductile and reversible HCP martensite.