Fine-grained dual-phase high-entropy ceramics derived from boro/carbothermal reduction
| Autor: | Si-Chun Luo, Kevin P. Plucknett, Wei-Ming Guo, Hua-Tay Lin |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
010302 applied physics
Materials science Sintering 02 engineering and technology 021001 nanoscience & nanotechnology Microstructure 01 natural sciences Grain size BORO chemistry.chemical_compound chemistry Boride visual_art Phase (matter) 0103 physical sciences Vickers hardness test Materials Chemistry Ceramics and Composites visual_art.visual_art_medium Ceramic Composite material 0210 nano-technology |
| Zdroj: | Journal of the European Ceramic Society. 41:3189-3195 |
| ISSN: | 0955-2219 |
| DOI: | 10.1016/j.jeurceramsoc.2020.12.044 |
| Popis: | 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 MPam 1/2). |
| Databáze: | OpenAIRE |
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