Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys
AbstractThe 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
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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.
Tsai C-W, Sung K-C, Kasai K, Murakami H. Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys. Entropy. 2016; 18(10):376.Chicago/Turabian Style
Tsai, Che-Wei; Sung, Kuen-Cheng; Kasai, Kzauki; Murakami, Hideyuki. 2016. "Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys." Entropy 18, no. 10: 376.
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