Role of Al and Cr on cyclic oxidation behavior of AlCoCrFeNi2 high entropy alloy

Kumar T., Sudeep and Sourav, Ayush and Murty, B.S. and et al, . (2022) Role of Al and Cr on cyclic oxidation behavior of AlCoCrFeNi2 high entropy alloy. Journal of Alloys and Compounds, 919. pp. 1-10. ISSN 0925-8388

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Abstract

In this work, cyclic oxidation behavior of AlCoCrFeNi2, Al1.5CoCrFeNi2, AlCoCr1.5FeNi2, and Al1.5CoCr1.5FeNi2 High Entropy Alloys (HEAs) has been studied at 1050 °C for 10 cycles to understand the effect of Al and Cr in AlCoCrFeNi2 based HEAs. X-ray photoelectron spectroscopy, X-ray diffraction, electron backscattered diffraction, scanning electron microscopy with energy dispersive spectroscopy were used to study the base metals and oxidized samples. It was found that in all the samples, face centered cubic, and body centered cubic phases were present in different phase fractions. Al1.5CoCrFeNi2 alloy shows lower oxidation rate with oxidation rate constant (Kp) in the order of 10−13 g2cm−4s−1. The lowest oxidation rate of Al1.5CoCrFeNi2 alloy is attributed to the presence of higher Al content as it forms protective continuous thin Al2O3 oxide layer which suppress further oxidation by preventing ingress of oxygen into the substrate. Presence of higher Cr content results in forming protective Cr2O3 oxide layer but eventually it spalls off leading to the exposure of substrate for further oxidation. © 2022 Elsevier B.V.

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IITH Creators:
IITH CreatorsORCiD
Murty, B Shttps://orcid.org/0000-0002-4399-8531
Item Type: Article
Additional Information: We are very thankful to Dr. C.P Ramanarayanan, Vice-Chancellor, DIAT (DU) for constant support. We are thankful to the Director, Defence Metallurgical Research Laboratory ( DMRL ), for providing us the arc melting facility. One of the authors (TS) gratefully acknowledge Science & Engineering Research Board, Department of Science & Technology ( DST ), India (No: EEQ/2017/000724 ), and Defence Institute of Advanced Technology , Pune, India (DIAT/F/Adm/Project/OM/Mate/Corr/P49) for funding this work.
Uncontrolled Keywords: Bond coat; Cyclic oxidation; Effect of Al and Cr; High Entropy Alloys (HEAs); X-ray photoelectron spectroscopy (XPS)
Subjects: Others > Metallurgy Metallurgical Engineering
Divisions: Department of Material Science Engineering
Depositing User: . LibTrainee 2021
Date Deposited: 27 Jul 2022 05:51
Last Modified: 27 Jul 2022 05:51
URI: http://raiith.iith.ac.in/id/eprint/9483
Publisher URL: http://doi.org/10.1016/j.jallcom.2022.165820
OA policy: https://v2.sherpa.ac.uk/id/publication/13772
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