Abstract
In this study, the effect of Al content on microstructure and high-temperature oxidation behavior of AlxMnCrCoFeNi (x = 0, 0.2, 0.4, 1) high-entropy alloys were investigated. High-entropy alloys with different compositions were synthesized by vacuum melting. Analysis of the microstructure and phase composition was performed by Backscatter Electron Microscopy and X-ray diffraction methods. The microstructures of the alloys were FCC for Al0 and FCC + BCC/B2 for other alloys. Cyclic oxidation tests were performed in an air atmosphere for 120 h at 1000 °C. The oxidation kinetics obeyed the parabolic law, and the main component of the oxide layer was Mn oxide. With increasing Al, a fine and dense Al2O3 oxide film was formed at the bottom of the oxide layer. The parabolic rate constant (Kp) decreased with Al content up to 8 at.%, whereas a further increase in Al concentration to 16 at.% revealed an inverse effect.
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The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.
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This research was supported by Iran National Science Foundation (INSF) (Grant No. 98002224).
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Familifard, A., Amadeh, A.A., Raygan, S. et al. The role of Al on microstructure and high-temperature oxidation behavior of AlxMnCrCoFeNi (x = 0, 0.2, 0.4, 1) high-entropy alloys. Journal of Materials Research 38, 1197–1210 (2023). https://doi.org/10.1557/s43578-022-00876-9
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DOI: https://doi.org/10.1557/s43578-022-00876-9