Evolution in microstructure and corrosion behavior of AlCoCrxFeNi high-entropy alloy coatings fabricated by laser cladding

By Y. Q. Jiang, J. Li, Y. Juan, Z. Lu, W. Jia. Journal of Alloys and Compounds, 2019

189 citations recorded by the source corpus.

Abstract AlCoCrxFeNi high-entropy alloys (HEAs) coatings were prepared on the surface of 45# steel by laser cladding with different contents of Cr (x = 0.50, 0.75, 1.00, 1.50, 2.00). A model was established to estimate the content of each component in the coatings, based on which three parameters including mixing entropy (△Smix), net driving factor (Ω) (Ω = Tm⋅△Smix/|△Hmix| Ω = T m ⋅ S m i x / | △ H m i x | ), and atomic size difference (δ) were calculated to precisely predict phase constituents in the coatings. The evolution in microstructure and corrosion behavior of the coatings with the change in x was investigated comprehensively. Results indicated that the dilution rate of the coatings was gradually increased with the increase in x. The coatings with x = 1.00 and 1.50 were composed of a single solid solution with the face-centered cubic (FCC) structure. A small number of fine equiaxial FeAl3 particles were also observed in the coatings with x = 0.50, 0.75, 2.00. Corrosion resistance of the coatings was improved first and then decreased with the increase in x in the electrochemical tests carried out in 0.1 mol L−1 HCl and 3.5 wt% NaCl solutions. The similar phenomenon was observed in the immersion tests. The optimum corrosion resistance was obtained in the coating with x = 1.50, in which the content of Cr reached the maximum value. Corrosion resistance of 45# steel could be considerably improved by laser cladding an AlCoCrxFeNi HEA coating on its surface.

Subfields: Aerospace Engineering, Mechanical Engineering

View Paper: https://www.semanticscholar.org/paper/7757938326f9299f9dc222ac9960862af21ed3f2

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In Aerospace Engineering

1. R. S. Kottada
2. B. S. Murty
3. Andrew S. M. Ang
4. Christopher C. Berndt

In Mechanical Engineering

1. R. S. Kottada
2. B. S. Murty
3. Andrew S. M. Ang
4. Christopher C. Berndt

Citations in the corpus

• Multiscale mechanical performance and corrosion behaviour of plasma sprayed AlCoCrFeNi high-entropy alloy coatings (2021, background): “This oxide film impedes the attack of electrolyte and reduces the dissolution of the corrosion prone phases [82].”