Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings
To improve high-temperature oxidation resistance for Ti6Al4V alloy, Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi (x = 0, 0.3, 0.5, 0.7, 1.0; y = 1.0, 0.7, 0.5, 0.3, 0, x + y = 1.0) high-entropy alloy (HEA) coatings were prepared on the Ti6Al4V alloy substrate by a laser cladding tech...
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2025-01-01
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| author | Ling Zhou Hongxi Liu Qinghua Zhang Jiazhu Liang Yuanrun Peng Xuanhong Hao Chen Yang Yaxia Liu Yueyi Wang |
| author_facet | Ling Zhou Hongxi Liu Qinghua Zhang Jiazhu Liang Yuanrun Peng Xuanhong Hao Chen Yang Yaxia Liu Yueyi Wang |
| author_sort | Ling Zhou |
| collection | DOAJ |
| description | To improve high-temperature oxidation resistance for Ti6Al4V alloy, Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi (x = 0, 0.3, 0.5, 0.7, 1.0; y = 1.0, 0.7, 0.5, 0.3, 0, x + y = 1.0) high-entropy alloy (HEA) coatings were prepared on the Ti6Al4V alloy substrate by a laser cladding technique. The results show that the coatings were mainly composed of FCC, BCC, and Ti-rich phases. Severe segregation of the Cu element occurred in the CoCrCuFeNi HEA coatings as a Cu-rich phase (FCC2). The Cu-rich phases decreased with a decreasing Cu content and completely disappeared until the Al content reached 1.0. The microhardnesses of the Cu<sub>1.0</sub>, Cu<sub>0.7</sub>Al<sub>0.3</sub>, Cu<sub>0.5</sub>Al<sub>0.5</sub>, Cu<sub>0.3</sub>Al<sub>0.7</sub>, and Al<sub>1.0</sub> HEA coatings were 2.01, 2.06, 2.08, 2.09, and 2.11 times that of the substrate, and compared with those of a Ti6Al4V alloy substrate, the oxidation rates of the HEA coatings decreased by 55%, 51%, 47%, 42%, and 35%, respectively. The surface oxides of the five coatings were mainly composed of CuO, TiO<sub>2</sub>, Fe<sub>3</sub>O<sub>4</sub>, Cr<sub>2</sub>O<sub>3</sub>, and Al<sub>2</sub>O<sub>3</sub>. The increase in the Al content promoted the generation of Al<sub>2</sub>O<sub>3</sub> film and Cr<sub>2</sub>O<sub>3</sub> on the surfaces of the coatings, which significantly improved the high-temperature antioxidant performance of the high-entropy alloy coatings for 50 h at 800 °C. When x = 1.0, the coating showed the best high-temperature antioxidant performance. |
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| institution | Kabale University |
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| spelling | doaj-art-0bf08a23acc44afa8c60fa1946334aba2025-01-24T13:36:26ZengMDPI AGJournal of Manufacturing and Materials Processing2504-44942025-01-01911310.3390/jmmp9010013Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy CoatingsLing Zhou0Hongxi Liu1Qinghua Zhang2Jiazhu Liang3Yuanrun Peng4Xuanhong Hao5Chen Yang6Yaxia Liu7Yueyi Wang8Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaFaculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, ChinaTo improve high-temperature oxidation resistance for Ti6Al4V alloy, Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi (x = 0, 0.3, 0.5, 0.7, 1.0; y = 1.0, 0.7, 0.5, 0.3, 0, x + y = 1.0) high-entropy alloy (HEA) coatings were prepared on the Ti6Al4V alloy substrate by a laser cladding technique. The results show that the coatings were mainly composed of FCC, BCC, and Ti-rich phases. Severe segregation of the Cu element occurred in the CoCrCuFeNi HEA coatings as a Cu-rich phase (FCC2). The Cu-rich phases decreased with a decreasing Cu content and completely disappeared until the Al content reached 1.0. The microhardnesses of the Cu<sub>1.0</sub>, Cu<sub>0.7</sub>Al<sub>0.3</sub>, Cu<sub>0.5</sub>Al<sub>0.5</sub>, Cu<sub>0.3</sub>Al<sub>0.7</sub>, and Al<sub>1.0</sub> HEA coatings were 2.01, 2.06, 2.08, 2.09, and 2.11 times that of the substrate, and compared with those of a Ti6Al4V alloy substrate, the oxidation rates of the HEA coatings decreased by 55%, 51%, 47%, 42%, and 35%, respectively. The surface oxides of the five coatings were mainly composed of CuO, TiO<sub>2</sub>, Fe<sub>3</sub>O<sub>4</sub>, Cr<sub>2</sub>O<sub>3</sub>, and Al<sub>2</sub>O<sub>3</sub>. The increase in the Al content promoted the generation of Al<sub>2</sub>O<sub>3</sub> film and Cr<sub>2</sub>O<sub>3</sub> on the surfaces of the coatings, which significantly improved the high-temperature antioxidant performance of the high-entropy alloy coatings for 50 h at 800 °C. When x = 1.0, the coating showed the best high-temperature antioxidant performance.https://www.mdpi.com/2504-4494/9/1/13high-entropy alloylaser claddinghigh-temperature oxidation resistancemicrostructureTi6Al4V alloy |
| spellingShingle | Ling Zhou Hongxi Liu Qinghua Zhang Jiazhu Liang Yuanrun Peng Xuanhong Hao Chen Yang Yaxia Liu Yueyi Wang Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings Journal of Manufacturing and Materials Processing high-entropy alloy laser cladding high-temperature oxidation resistance microstructure Ti6Al4V alloy |
| title | Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings |
| title_full | Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings |
| title_fullStr | Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings |
| title_full_unstemmed | Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings |
| title_short | Effect of Al/Cu Ratio on Microstructure and High-Temperature Oxidation Resistance of Al<sub>x</sub>CoCrCu<sub>y</sub>FeNi High-Entropy Alloy Coatings |
| title_sort | effect of al cu ratio on microstructure and high temperature oxidation resistance of al sub x sub cocrcu sub y sub feni high entropy alloy coatings |
| topic | high-entropy alloy laser cladding high-temperature oxidation resistance microstructure Ti6Al4V alloy |
| url | https://www.mdpi.com/2504-4494/9/1/13 |
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