Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 41, Issue 6, Pages 3189-3195Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.12.044
Keywords
Dual-phase high-entropy ceramics; Boro/carbothermal reduction; Densification; Microstructure; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [51832002, 51402055, 51602060, U1401247]
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In this work, fine-grained dual-phase high-entropy ceramics were successfully prepared by adjusting the content of B4C and C in the precursor powders. The combination of pinning effect and the boro/carbothermal reduction approach significantly reduced the average grain size, resulting in improved hardness and fracture toughness of the ceramics.
In the current work, fine-grained dual-phase, high-entropy ceramics (Ti0.2Zr0.2Hf0.2Nb0.2Ta0.2)B-2-(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 (similar to 0.5-1.5 mu m) 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)).
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