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Communication Dans Un Congrès Année : 2024

Behavior in cooling-induced oxide scale spallation of original and modified Cantor's HEA alloys oxidized at high temperature

Résumé

High Entropy Alloys; equimolar CoNiFeMnCr composition: Cantor Alloy • Adding MC carbides -> increase in mechanical resistance at H.T. • Isothermal oxidation behavior at 1000°C and 1100°C (shown today, at 2:20 PM) – Mass gain kinetic: parabolic but … – Very fast for the Cantor alloys and its {+MC} derivatives – Slowed down if Mn content decreases to 10 at.% and ­ Cr content increases to 30 at.% (but still worse than Ni–30 wt.%Cr) • More or less protection by the external multi–constituted oxide scale • THIS WORK: how does this complex scale behave if temperature varies? -> first answers available in the cooling parts of the thermogravimetry curves Increasing Mn and ­increasing Cr indisputably improve the resistance against scale spallation • Difference probably due to scales not as thick as for Mn1Cr1 alloys • But obvious lack of mechanical resistance of these multi–constituted scales • Mn: ­ isothermal oxidation, takes part to scales more than Cr, thus a double deleterious effect on the scales which still exists even if %Mn is lowered -> Remove all Mn from Cantor’s alloy derivatives destined to T ≥ 1000°C ->Testing new alloys as here and also for much faster and repeated coolings
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hal-04496986 , version 1 (09-03-2024)

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  • HAL Id : hal-04496986 , version 1

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Nassima Chenikha, Corentin Gay, Pauline Spaeter, Lionel Aranda, Patrice Berthod. Behavior in cooling-induced oxide scale spallation of original and modified Cantor's HEA alloys oxidized at high temperature. Minerals, Metals & Materials Society (TMS) 2024 153rd annual meeting and Exhibition, The Minerals, Metals and Materials Society, Mar 2024, Orlando, United States. ⟨hal-04496986⟩
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