Effects of Fe/Ni Ratio on Microstructure and Properties of FeNiCrAlNb High‐Entropy Alloys

Herein, the effects of Fe/Ni ratio on the microstructure, mechanical properties, and corrosion resistance in a 3.5 wt% NaCl solution of Fe x Ni 65− x Cr 20 Al 10 Nb 5 are investigated systematically. It is found that the phases shifted from the FCC‐dominated to the BCC‐dominated with the molar ratio of the Fe/Ni increased. The strength of Fe x Ni 65− x Cr 20 Al 10 Nb 5 increases with the molar ratio of Fe/Ni further increased, while the plasticity decreases. The yield strength reaches 1,653 MPa at x = 45. The alloy exhibits the best corrosion resistance when x = 35 which is attributed to the dominant FCC phases in the dendritic region.