期刊
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
卷 105, 期 1, 页码 606-613出版社
WILEY
DOI: 10.1111/jace.18100
关键词
carbides; high-entropy ceramics; high-pressure sintering; nanocrystalline ceramics
资金
- National Natural Science Foundation of China [51802100, 51972116, 52122204]
- Guangdong Basic and Applied Basic Research Foundation [2019A1515012145, 2021A1515010603]
- FundamentalResearch Foundation for the Central Universities [2020ZYGXZR080]
- Creative Research Foundation of the Science, Technology on Thermostructural Composite Materials Laboratory [JCKYS2020607003]
- China Postdoctoral Science Foundation [2021M691051]
Nanocrystalline (Hf0.25Zr0.25Ta0.25Ti0.25)C high-entropy carbide ceramics were successfully prepared through high-pressure sintering, showing improved mechanical properties at 1600 degrees C. Furthermore, the high-temperature Vickers hardness exhibited a linear decrease, influenced by the ZrO2 impurity phase at grain boundaries and the softening effect at elevated temperatures.
The nanocrystalline (Hf0.25Zr0.25Ta0.25Ti0.25)C high-entropy carbide ceramics were successfully prepared through high-pressure sintering of the self-synthesized nanopowders for the first time. The results showed that the relative density, grain size, hardness, and elastic modulus of all the as-prepared samples increased gradually with the increase of sintering temperatures from 1200 to 1600 degrees C. The as-fabricated samples at 1600 degrees C possessed a relative density of 97.1% and a mean grain size of 98 +/- 35 nm and simultaneously exhibited good comprehensive mechanical properties with Vickers hardness of 25.7 +/- 0.6 GPa and fracture toughness of 4.3 +/- 0.4 MPa center dot m(1/2) at room temperature due to the grain refinement strengthening mechanism and microcrack deflection and bridging toughening mechanism. In addition, they showed a linear decrease in high-temperature Vickers hardness with the increase of the temperature from room temperature to 1000 degrees C, which was determined by the combined effects of the intrinsic softening of HEC-1 ceramics at elevated temperature and the presence of ZrO2 impurity phase at the grain boundaries.
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