Microstructures and properties of Crx-FeNiCu0.5Ti0.5 high-entropy alloys for corrosion resistance

In this study, a novel high entropy alloy (HEA) of Crx-FeNiCu0.5Ti0.5 (in mole ratio, x = 0, 0.3, 0.5, 0.7, 0.9 and 1.2) was designed and prepared by arc melting to investigate its microstructure and corrosion resistant behavior. The phase analysis manifested that the microstructures transformed fro...

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Veröffentlicht in:Intermetallics 2023-02, Vol.153, p.107781, Article 107781
Hauptverfasser: Lin, Chun, Meng, Long, Tan, Mingtian, Ke, Lingsheng, Qi, Tao
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Sprache:eng
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Zusammenfassung:In this study, a novel high entropy alloy (HEA) of Crx-FeNiCu0.5Ti0.5 (in mole ratio, x = 0, 0.3, 0.5, 0.7, 0.9 and 1.2) was designed and prepared by arc melting to investigate its microstructure and corrosion resistant behavior. The phase analysis manifested that the microstructures transformed from face-centered cubic (FCC) + intermetallic compounds (IMs) of Cr-free alloy to FCC + IMs + body-centered cubic (BCC) phase with the increase of Cr molar ratio. The potentiodynamic polarization curves indicated that FeCr0.7NiCu0.5Ti0.5 alloy showed good corrosion performance with a corrosion potential of −0.181 V and a self-corrosion current density of 5.455 × 10−7 A/cm2 in 0.5 M H2SO4 solution. The chemical composition from XPS test displayed that Cr2O3, TiO2 and Fe-oxides on the sample surface form different strength passive films, reducing ionic diffusion and improving corrosion resistant, which was the key anti-corrosive mechanism. •The novel FeCrxNiCu0.5Ti0.5 (x = 0–1.2) high-entropy alloys are designed and prepared.•The doped Cr promote the formation of BCC phase.•FeCr0.7NiCu0.5Ti0.5 alloys show excellent corrosion resistance in 0.5 M H2SO4.•Secondary passivation and strong corrosion resistant phases hinder corrosion.
ISSN:0966-9795
1879-0216
DOI:10.1016/j.intermet.2022.107781