Oxidation of Fe35Mn21Ni20Cr12Al12 High Entropy Alloy in Dry Air

Author:

Mohamed Lamiaa Z.1ORCID,Abd ElMoamen Sanaa S.2ORCID,Yoo Seung Jo3,Gepreel Mohamed Abdel-Hady4ORCID

Affiliation:

1. Mining, Petroleum, and Metallurgical Engineering Department, Faculty of Engineering, Cairo University, Giza P.O. Box 12613, Egypt

2. Tabbin Institute for Metallurgical Studies, Helwan P.O. Box 11421, Egypt

3. Research Center for Materials Analysis, Korea Basic Science Institute (KBSI), Daejeon 34133, Republic of Korea

4. Materials Science and Engineering, Egypt-Japan University of Science and Technology (E-JUST), New Borg El-Arab City 21934, Egypt

Abstract

The isothermal oxidation of a Fe35Mn21Ni20Cr12Al12 high entropy alloy (HEA) was investigated in dry air for 50 h at 500, 600, and 700 °C after 90% cold rolling. The Fe35Mn21Ni20Cr12Al12 HEA behaves according to the linear oxidation rate with rate constants of 1 × 10−6, 3 × 10−6, and 7 × 10−6 g/(cm2·s) for oxidation at 500 °C, 600 °C, and 700 °C, respectively. The activation energy for oxidation of the HEA was calculated to be 60.866 KJ/mole in the 500–700 °C temperature range. The surface morphology and phase identification of the oxide layers were characterized. The formation of MnO2, Mn2O3, Mn3O4, Cr2O3, and Al2O3 in the oxide layers along with Fe2O3 is the key to the oxidation mechanism. The elemental mapping and line EDX scans were performed to identify the oxidation mechanisms.

Funder

Tabbin Institute for Metallurgical Studies

ICC-IMR program of the Institute for Materials Research, Tohoku University

Publisher

MDPI AG

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