Behaviour of Nickel-Rich Non-Equimolar High Entropy Alloys in High-Temperature Oxidizing Conditions

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  • Gawel Richard
    AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Physical Chemistry and Modelling
  • Rogal Łukasz
    Polish Academy of Sciences, Institute of Metallurgy and Materials
  • Dąbek Jarosław
    AGH University of Science and Technology, Faculty of Materials Science and Ceramics, Department of Physical Chemistry and Modelling

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<p>This study aims to compare the behaviour of two Ni-rich non-equimolar AlCoCrFeNi high entropy alloys, i.e. Al20Co5Cr20Fe20Ni35 and Al10Co15Cr20Fe20Ni35 (at%) in isothermal high-temperature oxidizing conditions. In both cases, mass gain after 100-hr oxidation at 1173 K in synthetic air atmosphere does not exceed 1 mg/cm2, indicating good resistance against the corrosive environment. Investigations on the morphology, chemical and phase composition of the alloys after the oxidation process indicate that a mixture of Al2O3 and Cr2O3 is responsible for the protective properties of the scale formed on Al20Co5Cr20Fe20Ni35, whereas an additional chromium–iron–nickel–cobalt spinel structure was determined on the Al10Co15Cr20Fe20Ni35 sample after prolonged exposure to the above-mentioned conditions. The oxidation kinetics are slightly better in the case of Al20Co5Cr20Fe20Ni35 and lower amounts of the remaining constituent elements were detected in the protective scale compared to Al10Co15Cr20Fe20Ni35. Furthermore, the Al20Co5Cr20Fe20Ni35 substrate was able to maintain its initial morphology throughout the entire alloy after the corrosion process. From all of the above, it can be concluded that Al20Co5Cr20Fe20Ni35 seems to demonstrate better oxidation properties at a high temperature than Al10Co15Cr20Fe20Ni35.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (4), 442-449, 2022-04-01

    公益社団法人 日本金属学会

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