Fine-grained dual-phase high-entropy ceramics derived from boro/carbothermal reduction |
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Authors: | Si-Chun Luo Wei-Ming Guo Kevin Plucknett Hua-Tay Lin |
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Affiliation: | 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 |
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Abstract: | In the current work, fine-grained dual-phase, high-entropy ceramics (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B2-(Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)C with different phase ratios were prepared from powders synthesized via a boro/carbothermal reduction approach, by adjusting the content of B4C and C in the precursor powders. Phase compositions, densification, microstructure, and mechanical properties were investigated and correlated. Due to the combination of pinning effect and the boro/carbothermal reduction approach, the average grain size (~0.5?1.5 μm) of the dual-phase high-entropy ceramics was roughly one order of magnitude smaller than previously reported literature. The dual-phase high-entropy ceramics had residual porosity ranging from 0.3 to 3.2 % upon sintering by SPS and the material with about 18 vol% boride phase exhibited the highest Vickers hardness (24.2±0.3 GPa) and fracture toughness (3.19±0.24 MPam1/2). |
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Keywords: | Dual-phase high-entropy ceramics Boro/carbothermal reduction Densification Microstructure Mechanical properties |
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