Microstructural evolution, mechanical and wear properties, and corrosion resistance of as-cast CrFeNbTiMox Refractory high entropy alloys

Chen, Ba; Li, Xinmei; Chen, Wenjie; Li, Shang; Jia, Liming

doi:10.1016/j.intermet.2023.107829

Cited by 13 publications

(1 citation statement)

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“…This phenomenon is considered to be an important factor in improving the stability of passivating films. 51 This suggests that aluminum doping increases the content of metal oxides in the passivating film and thus improves the stability of the passivating film. However, the formation of (Al, Ni)-rich body-centered cubic (BCC) phases leads to localized corrosion, and the oxide layer of alloys with higher Al content is not as protective as the oxide layer of alloys with lower Al content.…”

Section: Analysis Of Passivation Filmmentioning

confidence: 99%

Corrosion Behavior of Al-Containing CoNiV Medium Entropy Alloy Coating Fabricated by Laser Cladding

Fei,

Xu,

Zhang

et al. 2024

Langmuir

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CoNiV medium entropy alloys (MEAs) have been widely recognized for their superior corrosion resistance. Nonetheless, their extensive application has been hindered by high production costs and complex fabrication processes. In this study, CoNiVAl x MEA coatings were synthesized on AISI 304 stainless steel substrates via laser cladding technology. The microstructure, phase composition, corrosion resistance, and corrosion mechanisms of the coatings were systematically investigated by using advanced characterization techniques, including optical microscopy, scanning electron microscopy, transmission electron microscopy, X-ray diffractometry, and electrochemical workstation analysis. The ratio of O 2− /OH − in the passivation film of the coated surface exhibited a gradual increase with the addition of Al. The formation of the Alcontaining precipitated phase L2 1 was observed at x = 0.3 and 0.4. The results demonstrated that moderate Al doping (x ≤ 0.2) enhanced corrosion resistance by improving the stability of the passivation film and reducing the thermodynamic tendency toward corrosion. In contrast, excessive Al doping (x > 0.2) led to the formation of the L2 1 phase, which increased the susceptibility to localized corrosion, thus compromising the overall corrosion resistance.

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Section: Analysis Of Passivation Filmmentioning

confidence: 99%