Effect of aluminium content on antioxidant behaviour and oxidation kinetics of (CoCrNi)96-xTa4Alx(x=3, 6, 12) high entropy alloy

doi:10.13251/j.issn.0254-6051.2024.10.037

Abstract

Abstract: In order to develop new alloy materials with excellent high temperature oxidation resistance, Al and Ta was added in a synergistic manner into the base substrate of CoCrNi alloy to prepare (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy, and the effect of Al content on microstructure, phase structure, high temperature oxidation resistance and oxidation kinetics at 1200 ℃ of the alloy was studied. The results show that with the increase of Al content, the matrix of the (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy gradually transforms from FCC phase to BCC phase, and the (CoCrNi)₉₀Ta₄Al₆ alloy forms FCC+BCC dual-phase. The (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy exhibits good oxidation resistance after high temperature cyclic oxidation at 1200 ℃. Moreover, with the increase of Al content, the oxidation resistance also increases, and the oxidation kinetic curve and oxidation rate constant are stable. The surface oxide layer of the (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy after oxidation is mainly composed of Cr₂O₃, Al₂O₃ and a small amount of Ta₂O₅. The complete and dense oxide layer formed at high temperature effectively protects the alloy, so that the high temperature oxidation resistance of the alloy is very excellent.

Key words: high entropy alloy, microstructure, high temperature oxidation, oxidation kinetics

CLC Number:

TG172.82

Tang Quan, Tong Yonggang, Hu Yongle, Yang Lingwei, Deng Dunying. Effect of aluminium content on antioxidant behaviour and oxidation kinetics of (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy[J]. Heat Treatment of Metals, 2024, 49(10): 226-233.

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Effect of aluminium content on antioxidant behaviour and oxidation kinetics of (CoCrNi)_96-xTa₄Al_x(x=3, 6, 12) high entropy alloy

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