Abstract
CoNiFeMnCr alloys are possibly alternative solutions to cast cobalt or nickel superalloys able for service at 1000 °C and beyond. The partial substitution of Co and Ni by Fe and Mn allow lower dependence on the Co and Ni critical elements. In this work, equimolar CoNiFeMnCr alloys without or with added carbon and tantalum or hafnium were elaborated by high-frequency induction melting under inert atmosphere. Script-like eutectic TaC or HfC were obtained in the grain boundaries of the concerned alloys, forming a strengthening carbides network. Oxidation tests were carried out in air at 1000 °C and at 1100 °C for 50 h. The oxide scale externally formed is made of (Cr,Mn)2O3. Internal oxidation led to CrTaO4 or HfO2 oxides. Numerous deep oxidation penetrations were noted for the CoNiFeMnCr alloy while the MC-containing alloys were not affected by this phenomenon, evidencing a possible beneficial influence of the presence of the carbides on the oxidation behavior.
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Acknowledgements
The author wishes to thank Pierre–Jean Panteix for his help for the oxidation tests in furnace.
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Berthod, P. (2023). High Temperature Oxidation of CoNiFeMnCr High Entropy Alloys Reinforced by MC-Carbides. In: TMS 2023 152nd Annual Meeting & Exhibition Supplemental Proceedings. TMS 2023. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-031-22524-6_86
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DOI: https://doi.org/10.1007/978-3-031-22524-6_86
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