Influence of Cu content on high temperature oxidation behavior of AlCoCrCuxFeNi high entropy alloys (x = 0; 0.5; 1) |
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| Affiliation: | 1. AGH University of Science and Technology, Faculty of Materials Science and Ceramics, al. Mickiewicza 30, 30-059 Kraków, Poland;2. Warsaw University of Technology, Faculty of Materials Science and Engineering, ul. Wołoska 141, 02-507 Warszawa, Poland;3. Pedagogical University of Cracow, Institute of Technology, ul. Podchorążych 2, 30-084 Kraków, Poland;4. AGH University of Science and Technology, Academic Centre for Materials and Nanotechnology, al. Mickiewicza 30, 30-059 Kraków, Poland;1. Institute of Materials Engineering, National Taiwan Ocean University, Keelung, 20224, Taiwan, ROC;2. Department of Mechanical and Biomedical Engineering, The City University of Hong Kong, Kowloon, Hong Kong;3. Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30050, Taiwan, ROC;1. Institute of Materials Engineering, National Taiwan Ocean University, Keelung 20224, Taiwan, ROC;2. Department of Mechanical and Biomedical Engineering, The City University of Hong Kong, Kowloon, Hong Kong;3. Department of Engineering and System Science, National Tsing Hua University, Hsinchu 30050, Taiwan, Republic of China;1. Institute of Machinery Manufacturing Technology, Chinese Academy of Engineering Physics, Mianyang, Sichuan 621900, PR China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, PR China;1. School of Material Science and Engineering, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, PR China;2. The Jiangsu Province Engineering Laboratory of High Efficient Energy Storage Technology and Equipment, Xuzhou, Jiangsu, 221008, PR China;3. Shandong Institute of Nonmetallic Materials, Jinan, Shandong, 250031, PR China |
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| Abstract: | Studies on the oxidation behavior of high entropy alloys from the Al-Co-Cr-Cu-Fe-Ni metallic system were conducted. Three different high entropy alloys were synthesized using arc-melting method: AlCoCrFeNi, AlCoCrCu0.5FeNi and AlCoCrCuFeNi, with their crystal structures being respectively BCC, BCC and BCC + FCC. All alloys were oxidized in the air atmosphere at temperature of 1273 K for different time periods. Basing on the thermogravimetric result, the oxidation rate of the materials decreased with the increase of Cu content and the values of parabolic constants were on the level similar to those observed in Ni-Al intermetallic alloys. In all cases the oxide scale consisted of α-Al2O3, which exhibited poor adhesion to the surface during the cooling process, what was especially visible in alloys with Cu addition. In all oxidized samples a tendency towards formation of the Al-depleted FCC phase directly beneath the scale was observed. The phase constitution of all materials changed significantly during the oxidation process, with multiple new phases appearing in the system. |
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| Keywords: | Corrosion High entropy alloys Kinetics Phase transitions |
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