High Temperature Oxidation of Refractory High Entropy Alloys (RHEAs) and the Use of High Entropy Rare Earth Oxide (HERO) Coatings

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2024-05

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The Ohio State University

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Abstract

Refractory high entropy alloys (RHEAs) possess favorable material properties, such as high melting points, resistance to corrosion, microstructural stability, and mechanical strength, which makes them a strong candidate for aerospace, automotive, and nuclear applications. To ensure safe high temperature performance, understanding and minimizing the rate of oxygen diffusion, and specifically high temperature oxidation, in RHEAs is imperative. The inherent high temperature oxidation performance of two RHEA compositions provided by the United States Air Force Research Laboratory are being investigated, after varying high temperature exposures in a controlled oxygen environment for various time intervals. Additionally, the effects of surrounding each alloy in a high entropy rare earth oxide (HERO) sintered powder sheath provided by the University of Virginia is investigated under identical conditions. Dilatometry is used to compare thermal expansion between the substrates and HERO coating. Thermogravimetric analysis is used to measure oxidation resistance and SEM and X-ray techniques are used to understand the microstructure.

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Refractory High Entropy Alloys, High Entropy Rare Earth Oxide Coatings, High Temperature Oxidation

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