期刊
SCRIPTA MATERIALIA
卷 199, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2021.113855
关键词
High-entropy ceramics; high-entropy borides; superhard materials; Vickers hardness
类别
资金
- Enabling Materials for Extreme Environments Signature Area at Missouri ST
- National Science Foundation [CMMI-1902069]
Six different high-entropy diboride ceramics with AlB2 structure showed varying levels of hardness under different loads, with two compositions demonstrating superhard characteristics.
Hardness was measured for six different nominally pure and single-phase high-entropy diboride ceramics with the AlB2 structure that were produced by a two-step process. Most of the ceramics had relative densities greater than 99.5%. Vickers hardness average values ranged from 21.0 GPa to 25.4 GPa at a load of 9.81 N, while values increased to the range of 33.1 GPa to 48.3 GPa at a load of 0.49 N. Among the compositions, the highest hardness values at a load of 0.49 N were 48.3 +/- 2.3 GPa for (Cr0.2Hf0.2Ta0.2Ti0.2Zr0.2)B-2 and 45.8 +/- 5.3 GPa for (Hf0.2Ta0.2Ti0.2W0.2Zr0.2)B-2, both of which are high enough to be considered superhard. The present study demonstrated that high-entropy diboride ceramics are a new class of superhard materials. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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