High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys
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s41529-020-00129-2.pdf
Description
Published version
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3.65 MB
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Author(s)
Esmaily, Mohsen
Qiu, Yao
Bigdeli, Sedigheh
Venkataraman, Mahesh B.
Allanore, Antoine
Birbilis, Nick
Date Issued
August 2020
Journal
npj Materials Degradation
Publisher
Springer Science and Business Media LLC
Citation
Esmaily, Mohsen et al. "High-temperature oxidation behaviour of AlxFeCrCoNi and AlTiVCr compositionally complex alloys." npj Materials Degradation 4, 1 (August 2020): doi.org/10.1038/s41529-020-00129-2.
Version
Final published version
Abstract
Compositionally complex alloys (CCAs), also termed as high entropy alloys (HEAs) or multi-principal element alloys (MPEAs), are being considered as a potential solution for many energy-related applications comprising extreme environments and temperatures. Herein, a review of the pertinent literature is performed in conjunction with original works characterising the oxidation behaviour of two diverse Al-containing alloys; namely a lightweight (5.06 g/cm[superscript 3] single-phase AlTiVCr CCA and a multiple-phase Al[subscript 0.9]FeCrCoNi CCA (6.9[superscript 3]). The thermogravimetric results obtained during oxidation of the alloys at 700 and 900 °C revealed that both alloys tended to obey the desired parabolic rate law. Post-exposure analysis by means of electron microscopy indicated that while the oxide scale formed on the AlTiVCr is adherent to the substrate, the scale developed on the Al[subscript 0.9]FeCrCoNi displays a notable spalling propensity. This study highlights the need for tailoring the protective properties of the oxide scale formed on the surface of the CCAs.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
MIT Materials Research Laboratory
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Creative Commons Attribution 4.0 International license
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DOI of Published Version
https://doi.org/10.1038/s41529-020-00129-2
