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Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys

1
UES, Inc., 4401 Dayton-Xenia Road, Dayton, OH 45432-1805, USA
2
Department of Metallurgical and Materials Engineering, University of Alabama, Tuscaloosa, AL 35487-0202, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Michael C. Gao and Junwei Qiao
Metals 2016, 6(9), 222; https://doi.org/10.3390/met6090222
Received: 28 July 2016 / Revised: 2 September 2016 / Accepted: 5 September 2016 / Published: 12 September 2016
(This article belongs to the Special Issue High-Entropy Alloys (HEAs))
The understanding of the oxidation behaviors of as-cast and annealed high-entropy alloys (HEAs) is currently limited. This work systematically investigates the influence of annealing on the microstructures and oxidation behaviors of AlCoCrFeNi-based HEAs. Annealing was found to alter the distribution of Al-rich phases which caused a change in the oxidation mechanisms. In general, all three of the investigated HEAs displayed some degree of transient oxidation at 1050 °C that was later followed by protective, parabolic oxide growth. The respective oxidation behaviors are discussed relative to existing oxide formation models for Ni–Cr–Al alloys. View Full-Text
Keywords: high-entropy; oxidation; multi-component alloys high-entropy; oxidation; multi-component alloys
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Butler, T.M.; Weaver, M.L. Influence of Annealing on the Microstructures and Oxidation Behaviors of Al8(CoCrFeNi)92, Al15(CoCrFeNi)85, and Al30(CoCrFeNi)70 High-Entropy Alloys. Metals 2016, 6, 222.

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