| METALS AND METAL MATRIX COMPOSITES |
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| High-temperature Oxidation Behavior of Laser-Cladded NbMoTaWV Refractory High-entropy Alloy Coating |
| CHEN Feihuan1, CAI Zhaobing1,2,3,*, DONG Yinghui2, LIN Guangpei1, ZHANG Po1,2, LU Bingwen4, GU Le1,*
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1 Key Laboratory of Metallurgical Equipment and Control Technology, Ministry of Education, Wuhan University of Science and Technology, Wuhan 430081, China
2 Hubei Key Laboratory of Mechanical Transmission and Manufacturing Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
3 Precision Manufacturing Institute, Wuhan University of Science and Technology, Wuhan 430081, China
4 National Engineering Laboratory of Modern Materials Surface Engineering Technology, Institute of New Materials, Guangdong Academy of Sciences, Guangzhou 510650, China |
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Abstract Refractory high-entropy alloy (HEA) coatings have been a hot research topic in the field of HEAs in recent years and are expected to become an important high-temperature structural and functional material in the future. In this work, the NbMoTaWV refractory HEA coating was prepared by laser cladding, and its oxidation behavior at 800 ℃ was studied. The microstructure evolution, micro-hardness changes and interface diffusion behavior of NbMoTaWV refractory HEA coating at different oxidation time (10, 20, 30, 50, 100 h) were analyzed. The experimental results show that the NbMoTaWV refractory HEA coating is mainly composed of Fe7Ta3-type HCP solid solution phase, (Fe, Ni) matrix phase and un-melted HEA powder phase. After oxidation treatment at different time, the coating surface is formed with Fe2O3 and Fe3O4 as the main oxide phases. With high-temperature oxidation treatment at 800 ℃, the internal microstructure of NbMoTaWV refractory HEA coating has a little change, and only part of the oxygen elements diffuse into the coating. However, high-temperature oxidation results in the increased micro-hardness, and with the increase of oxidation time, the micro-hardness of NbMoTaWV refractory HEA coating increases first and then decreases. The micro-hardness reaches the maximum when the oxidation time is 20 h, which is related to the solid solution strengthening caused by high-tempe-rature diffusion. Moreover, TG-DSC confirms that NbMoTaWV refractory HEA coating has excellent high temperature stability at 800 ℃.
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Published: 25 May 2024
Online: 2024-05-28
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| Fund:National Natural Science Foundation of China (51905524, 52005113) and Guangdong Academy of Science Projects (2022GDASZH-2022010107). |
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2024, Vol. 38 
