Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Oxidation behavior at 1000°C of low–Mn high–Cr {Cantor’s HEA}–based alloys strengthened or not by MC carbides

Version 1 : Received: 18 July 2023 / Approved: 19 July 2023 / Online: 19 July 2023 (10:13:43 CEST)

A peer-reviewed article of this Preprint also exists.

Spaeter, P.; Gay, C.; Chenikha, N.; Medjahdi, G.; Vernière, A.; Rapin, C.; Aranda, L.; Berthod, P. Oxidation Behavior at 1000 °C of Low-Mn High-Cr Cantor’s HEA-Based Alloys Strengthened or Not by MC Carbides. Corros. Mater. Degrad. 2023, 4, 528-541. Spaeter, P.; Gay, C.; Chenikha, N.; Medjahdi, G.; Vernière, A.; Rapin, C.; Aranda, L.; Berthod, P. Oxidation Behavior at 1000 °C of Low-Mn High-Cr Cantor’s HEA-Based Alloys Strengthened or Not by MC Carbides. Corros. Mater. Degrad. 2023, 4, 528-541.

Abstract

A conventionally cast CoNiFeMn0.5Cr1.5 alloy and two versions with 0.25C&3.7Ta or 0.25C&3.7Hf were tested in oxidation at 1000°C for 50h with thermogravimetric recording of the oxidation kinetic. In all cases the obtained mass gain curves are parabolic. Their parabolic constants are much lower than the Kp previously determined for the original alloys with an equimolar base (CoNiFeMnCr). However, the post–mortem exploitation of the oxidized samples revealed analogous oxidation features on surface and subsurface, with here too external oxide strata on surface with different Mn and Cr contents, and rather great Mn–depletion in addition to a moderate Cr–depletion, in subsurface. Globally, the oxidation behavior is significantly better than earlier observed for the equimolar version of these alloys.

Keywords

Modified Cantor alloys; Manganese; Chromium; TaC; HfC; High temperature oxidation

Subject

Chemistry and Materials Science, Metals, Alloys and Metallurgy

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