Journal
CORROSION SCIENCE
Volume 183, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109341
Keywords
High-entropy alloy; Corrosion; XPS; Passive film; Deformation mechanism
Funding
- National Natural Science Foundation of China [51971248]
- Hunan Special Funding for the Construction of Innovative Province [2019RS1001]
- Innovation-Driven Project of Central South University [2020CX023]
- Fundamental Research Funds for the Central Universities [2020zzts072]
- Open Sharing Fund for the Large-scale Instruments and Equipments of Central South University [CSUZC202005]
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The newly developed non-equiatomic Fe40Ni20Co20Cr20 (at.%) high-entropy alloy (HEA) shows excellent strength-ductility synergy, improved corrosion resistance, and higher electrochemical corrosion resistance compared to other alloys. The stability of the passive film in the alloy is attributed to the interaction between Co and other elements, leading to the formation of Co(Fe,Cr)2O4.
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.
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