Host lattice and solid solution formation in an octal-cation (NbTaZrTiHfVWMo)C high entropy carbide ceramic |
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| Affiliation: | 1. College of Materials Science and Engineering, Hunan University, Changsha, Hunan 410082, China;2. Department of Mechanical Engineering, City University of Hong Kong, Hong Kong, China;3. Key Laboratory for Light-weight Materials, Nanjing Tech University, Nanjing, Jiangsu 210009, China;1. Department of Materials Science and Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA;2. Oak Ridge National Laboratory, Oak Ridge, TN 37830, USA;1. State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;2. Hubei Longzhong Laboratory, Wuhan University of Technology Xiangyang Demonstration Zone, Xiangyang 441000, China;3. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China;4. Jingdezhen Huaxun Special Ceramics Co. Ltd., Jingdezhen 333000, China;1. Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland;2. Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza 30 Av., 30-059 Cracow, Poland;1. College of Materials and Chemistry & Chemical Engineering, Chengdu University of Technology, Chengdu 610059, China;2. School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;1. Powder Metallurgy Research Institute, Central South University, Changsha 410083, China;2. College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China;3. Advanced Research Center, Central South University, Changsha 410083, China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin 150001, China;2. MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, State Key Laboratory of Urban Water Resource and Environment, School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin, China;3. Institute of Applied Physics and Materials Engineering (IAPME), University of Macau, Taipa 999078, Macao Special Administrative Region of China |
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| Abstract: | High entropy carbide ceramics (HECCs) exhibit property peculiarity, such as higher hardness and higher toughness than conventional binary counterparts. The cation-sites of HECCs consist of 4 or more types of transitional metals with equiatomic ratios. Our work advocates that the individual constituent carbide in HECCs cannot be treated equally; instead, one serves as the host lattice and other metallic elements occupy its cation-site lattice substitutionally. urging sintering before the completion of solid solution, individual carbides tend to bind with each other to form a variety of intermediate products. Specifically, in the octal-cation (NbTaZrTiHfVWMo)C carbide, TaC serves as the host lattice and a few intermediate products, such as (Zr,Hf)C and (Ti,V,W,Mo)C, formed. A dense and single-phase carbide can be obtained through sintering at a low temperature of 2000°C and the so-obtained carbide has a nanohardness of 38.71 GPa and a fracture toughness of ∼ 4.67 MPa·m1/2, outweighing a majority of the existing carbides. |
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| Keywords: | High entropy carbide ceramics Host lattice Solid solution formation Mechanical properties |
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