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Entropy 2016, 18(10), 376; doi:10.3390/e18100376

Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys

1
Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, Taiwan
2
Surface and Interface Kinetics Group, 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: 31 July 2016 / Revised: 7 October 2016 / Accepted: 14 October 2016 / Published: 20 October 2016
(This article belongs to the Special Issue High-Entropy Alloys and High-Entropy-Related Materials)
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Abstract

The isothermal oxidation resistance of Al0.2Co1.5CrFeNi1.5Ti0.3 high-entropy alloy is analyzed and the microstructural evolution of the oxide layer is studied. The limited aluminum, about 3.6 at %, leads to the non-continuous alumina. The present alloy is insufficient for severe circumstances only due to chromium oxide that is 10 μm after 1173 K for 360 h. Thus, the aluminized high-entropy alloys (HEAs) are further prepared by the industrial packing cementation process at 1273 K and 1323 K. The aluminizing coating is 50 μm at 1273 K after 5 h. The coating growth is controlled by the diffusion of aluminum. The interdiffusion zone reveals two regions that are the Ti-, Co-, Ni-rich area and the Fe-, Cr-rich area. The oxidation resistance of aluminizing HEA improves outstandingly, and sustains at 1173 K and 1273 K for 441 h without any spallation. The alumina at the surface and the stable interface contribute to the performance of this Al0.2Co1.5CrFeNi1.5Ti0.3 alloy. View Full-Text
Keywords: high entropy alloys; aluminizing; isothermal oxidation high entropy alloys; aluminizing; isothermal oxidation
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Tsai, C.-W.; Sung, K.-C.; Kasai, K.; Murakami, H. Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys. Entropy 2016, 18, 376.

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