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 FexNi65-xCr20Al10Nb5 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 FexNi65-xCr20Al10Nb5 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.

Automated summary

In this study, the effects of the Fe/Ni ratio on the microstructure, mechanical properties, and corrosion resistance of FexNi65-xCr20Al10Nb5 alloy in a 3.5 wt% NaCl solution were systematically investigated. It was observed that the dominant phases shifted from FCC to BCC with an increase in the Fe/Ni molar ratio. The strength of the alloy increased with a higher Fe/Ni ratio, while the plasticity decreased. The alloy exhibited the best corrosion resistance when x = 35, which was attributed to the dominant presence of FCC phases in the dendritic region.