Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys
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 d...
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MDPI AG
2016-10-01
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| Series: | Entropy |
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| Online Access: | http://www.mdpi.com/1099-4300/18/10/376 |
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| author | Che-Wei Tsai Kuen-Cheng Sung Kzauki Kasai Hideyuki Murakami |
| author_facet | Che-Wei Tsai Kuen-Cheng Sung Kzauki Kasai Hideyuki Murakami |
| author_sort | Che-Wei Tsai |
| collection | DOAJ |
| description | 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. |
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| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-04-11T12:18:34Z |
| publishDate | 2016-10-01 |
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| spelling | doaj.art-ba7248b8eca7491286d3556c057580f72022-12-22T04:24:10ZengMDPI AGEntropy1099-43002016-10-01181037610.3390/e18100376e18100376Isothermal Oxidation of Aluminized Coatings on High-Entropy AlloysChe-Wei Tsai0Kuen-Cheng Sung1Kzauki Kasai2Hideyuki Murakami3Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanDepartment of Materials Science and Engineering, National Tsing Hua University, Hsinchu 30013, TaiwanSurface and Interface Kinetics Group, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, JapanSurface and Interface Kinetics Group, National Institute for Materials Science, Sengen 1-2-1, Tsukuba, Ibaraki 305-0047, JapanThe 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.http://www.mdpi.com/1099-4300/18/10/376high entropy alloysaluminizingisothermal oxidation |
| spellingShingle | Che-Wei Tsai Kuen-Cheng Sung Kzauki Kasai Hideyuki Murakami Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys Entropy high entropy alloys aluminizing isothermal oxidation |
| title | Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys |
| title_full | Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys |
| title_fullStr | Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys |
| title_full_unstemmed | Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys |
| title_short | Isothermal Oxidation of Aluminized Coatings on High-Entropy Alloys |
| title_sort | isothermal oxidation of aluminized coatings on high entropy alloys |
| topic | high entropy alloys aluminizing isothermal oxidation |
| url | http://www.mdpi.com/1099-4300/18/10/376 |
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