Effect of carbon content on the microstructure and mechanical properties of high-entropy (Ti0.2Zr0.2Nb0.2Ta0.2Mo0.2)Cx ceramics |
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| Affiliation: | 1. Department of Materials Science and Engineering, The Pennsylvania State University, University Park, PA 16802, USA;2. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;3. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA;4. Sandia National Laboratories, Albuquerque, New Mexico 87123, USA;5. Center for Autonomous Materials Design and Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA;6. Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC 27695, USA |
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| Abstract: | High-entropy (Ti0.2Zr0.2Nb0.2Ta0.2Mo0.2)Cx ceramics, with different carbon contents (x=0.55?1), were prepared by spark plasma sintering using powders synthesized via a carbothermal reduction approach. Single-phase, high-entropy (Ti0.2Zr0.2Nb0.2Ta0.2Mo0.2)Cx ceramics could be obtained when using a carbon content of x=0.70?0.85. Combined ZrO2 and Mo-rich carbide phases, or residual graphite, existed in the ceramics due to either a carbon deficiency or excess at x=0.55 and 1, respectively. With the carbon content increased from x=0.70 to x=0.85, the grain size decreased from 4.36 ± 1.55 μm to 2.00 ± 0.91 μm, while the hardness and toughness increased from 23.72 ± 0.26 GPa and 1.69 ± 0.21 MPa·m1/2 to 25.45 ± 0.59 GPa and 2.37 ± 0.17 MPa·m1/2, respectively. This study showed that the microstructure and mechanical properties of high-entropy carbide ceramics could be adjusted by the carbon content. High carbon content is conducive to improving hardness and toughness, as well as reducing grain size. |
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| Keywords: | High-entropy carbide ceramics Carbon content Microstructure Grain size Mechanical properties |
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