Isothermal oxidation of aluminized coatings on high-entropy alloys

Che Wei Tsai; Kuen Cheng Sung; Kzauki Kasai; Hideyuki Murakami

doi:10.3390/e18100376

Isothermal oxidation of aluminized coatings on high-entropy alloys

Che Wei Tsai^*, Kuen Cheng Sung, Kzauki Kasai, Hideyuki Murakami

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

4 Citations (Scopus)

Abstract

The isothermal oxidation resistance of Al_0.2Co_1.5CrFeNi_1.5Ti_0.3 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 Al_0.2Co_1.5CrFeNi_1.5Ti_0.3 alloy.

Original language	English
Article number	376
Journal	Entropy
Volume	18
Issue number	10
DOIs	https://doi.org/10.3390/e18100376
Publication status	Published - 2016
Externally published	Yes

Keywords

Aluminizing
High entropy alloys
Isothermal oxidation

ASJC Scopus subject areas

Physics and Astronomy(all)

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10.3390/e18100376

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@article{83440e81f60b4c2492154831c7d37ed6,

title = "Isothermal oxidation of aluminized coatings on high-entropy alloys",

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.",

keywords = "Aluminizing, High entropy alloys, Isothermal oxidation",

author = "Tsai, {Che Wei} and Sung, {Kuen Cheng} and Kzauki Kasai and Hideyuki Murakami",

note = "Funding Information: The authors would like to thank the financial support from Ministry of Science and Technology, Taiwan, project grant number: 104-2218-E-007-017. Che-Wei Tsai would like to thank Murakami for discussion on the aluminization of HEAs and for supporting his stay at NIMS in Japan. Publisher Copyright: {\textcopyright} 2016 by the authors.",

year = "2016",

doi = "10.3390/e18100376",

language = "English",

volume = "18",

journal = "Entropy",

issn = "1099-4300",

publisher = "Multidisciplinary Digital Publishing Institute (MDPI)",

number = "10",

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TY - JOUR

T1 - Isothermal oxidation of aluminized coatings on high-entropy alloys

AU - Tsai, Che Wei

AU - Sung, Kuen Cheng

AU - Kasai, Kzauki

AU - Murakami, Hideyuki

N1 - Funding Information: The authors would like to thank the financial support from Ministry of Science and Technology, Taiwan, project grant number: 104-2218-E-007-017. Che-Wei Tsai would like to thank Murakami for discussion on the aluminization of HEAs and for supporting his stay at NIMS in Japan. Publisher Copyright: © 2016 by the authors.

PY - 2016

Y1 - 2016

N2 - 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.

AB - 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.

KW - Aluminizing

KW - High entropy alloys

KW - Isothermal oxidation

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Isothermal oxidation of aluminized coatings on high-entropy alloys

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Keywords

ASJC Scopus subject areas

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