A non-equiatomic FeNiCoCr high-entropy alloy with excellent anti-corrosion performance and strength-ductility synergy

By Pengfei Wu, Kefu Gan, Dingshun Yan, Z. Fu, Zhiming Li. 2021

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Abstract The mechanical behavior and corrosion resistance of a newly developed non-equiatomic Fe40Ni20Co20Cr20 (at.%) high-entropy alloy (HEA) were investigated. Excellent strength-ductility synergy with fracture elongation of more than 70 % was found to be mediated by dislocation activities and nano-twinning. The alloy shows significantly improved corrosion resistance compared to the equiatomic FeMnNiCoCr HEA upon immersion testing, and higher electrochemical corrosion resistance than the 316L stainless steel in 0.1 M H2SO4 solution. Apart from a high content of Cr3+ in the passive film, the interaction between Co and other elements potentially leads to the formation of Co(Fe,Cr)2O4 and enhances the passive film stability.

Subfields: Aerospace Engineering, Biomedical Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/5757d6305defa0a9fbf4686615468d109e7854f8