Synthesis,microstructure and mechanical properties of high-entropy (VNbTaMoW)C5 ceramics |
| |
| Affiliation: | 1. College of Materials Science & Engineering, North Minzu University, Yinchuan, China;2. Key Laboratory of Powders & Advanced Ceramics, North Minzu University, Yinchuan, China;1. Institute of Materials Research, Slovak Academy of Sciences, Division of Ceramic and Non-Metallic Systems, Watsonova 47, 040 01, Košice, Slovak Republic;2. Institute of Physics, Slovak Academy of Sciences, Dúbravská cesta 9, 845 11, Bratislava, Slovak Republic;3. Pavol Jozef Šafárik University in Košice, Faculty of Science, Institute of Physics, Department of Condensed Matter Physics, Park Angelinum 9, 040 01, Košice, Slovak Republic;4. School of Engineering & Materials Science and Nanoforce Technology Ltd., Queen Mary University of London, Mile End Road, London, E1 4NS, United Kingdom;1. State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Institute of Functional Materials, Donghua University, Shanghai, 201620, China;2. Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai, 200050, China;1. School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou, 510006, China;2. Department of Process Engineering and Applied Science, Dalhousie University, Halifax, B3J 1Z1, Canada |
| |
| Abstract: | High-entropy ceramics (HEC) with a fixed composition of (VNbTaMoW)C5 were prepared by spark plasma sintering (SPS) from 1500 °C to 2200 °C. XRD, TEM, HRTEM, SAED and EDX were used to investigate effects of the sintering temperatures on compositional homogeneity, constituent phases and microstructure of the HECs. The results showed that single-phase HEC formed at a temperature as low as 1600 °C while ultimate elemental distribution homogeneity could be obtained at 2200 °C. Elemental distribution homogenization was accompanied by microstructural coarsening and oxide impurities aggregating at grain boundaries as temperature increased. SPS at 1900 °C for 12 min could yield uniform HECs (VNbTaMoW)C5 with Vickers hardness, nanohardness, fracture toughness and Young’s modulus reaching 19.6 GPa, 29.7 GPa, 5.4 MPa m1/2 and 551 GPa, respectively. The resultant HECs showed excellent wear resistance when coupled with WC at room temperature. |
| |
| Keywords: | High-entropy ceramic Spark plasma sintering Microstructure Mechanical properties |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
