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Entropy 2016, 18(2), 62;

High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys

Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
Department of Mechanical and Automation Engineering, I-Shou University, Kaohsiung 84001, Taiwan
National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, Japan
Author to whom correspondence should be addressed.
Academic Editor: Kevin H. Knuth
Received: 11 January 2016 / Revised: 1 February 2016 / Accepted: 15 February 2016 / Published: 22 February 2016
(This article belongs to the Special Issue High-Entropy Alloys and High-Entropy-Related Materials)
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The present work investigates the high temperature oxidation and corrosion behaviour of high entropy superalloys (HESA). A high content of various solutes in HESA leads to formation of complex oxides, however the Cr and Al activities of HESA are sufficient to promote protective chromia or alumina formation on the surface. By comparing the oxidation and corrosion resistances of a Ni-based superalloy—CM247LC, Al2O3-forming HESA can possess comparable oxidation resistance at 1100 °C, and Cr2O3-forming HESA can exhibit superior resistance against hot corrosion at 900 °C. This work has demonstrated the potential of HESA to maintain surface stability in oxidizing and corrosive environments. View Full-Text
Keywords: alloy; superalloys; oxidation; hot corrosion alloy; superalloys; oxidation; hot corrosion

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Tsao, T.-K.; Yeh, A.-C.; Kuo, C.-M.; Murakami, H. High Temperature Oxidation and Corrosion Properties of High Entropy Superalloys. Entropy 2016, 18, 62.

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