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Communication Dans Un Congrès Année : 2024

Isothermal High Temperature Oxidation of Cantor's-based MC-reinforced HEAs versus their Mn and Cr Contents

Résumé

High Entropy Alloys / the equimolar CoNiFeMnCr composition (Cantor) • Adding MC carbides ® enhancement of the H.T. mechanical resistance • Unfortunately: bad oxidation behavior at 1000°C and beyond – Fast mass gains; Thick oxides scales after less than 100 hours – Only minor role of chromium; Oxide scales involving Mn more than Cr • Possible way for improving resistance against oxidation: ¯ Mn and ­ Cr • THIS WORK: investigation of H.T. oxidation of new alloys with less Mn and more Cr • Decreasing Mn and ­ increasing Cr indisputably improve the H.T. oxidation behavior • The new oxidation resistances are still below the Ni–30Cr’s one • MC carbides degrade oxidation resistance (especially HfC) • Oxides scales are multi–constituted and too porous to be really protective ->Removing all Mn and testing CoNiFeCr + MC alloys (alloys at the frontier between Cantor’s alloy and Co-based/Ni-based alloys) or ->Replacing Mn by M’ and testing CoNiFeM’Cr + MC alloys (e.g. starting from the already existing CoNiFeCuCr HEAs)
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hal-04496979 , version 1 (09-03-2024)

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  • HAL Id : hal-04496979 , version 1

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Pauline Spaeter, Nassima Chenikha, Corentin Gay, Lionel Aranda, Patrice Berthod. Isothermal High Temperature Oxidation of Cantor's-based MC-reinforced HEAs versus their Mn and Cr Contents. TMS 2024 153rd Annual Meeting & Exhibition, The Minerals, Metals and Materials Society, Mar 2024, Orlando, United States. ⟨hal-04496979⟩
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