Superhard high-entropy AlB2-type diboride ceramics

被引：82
作者：
Feng, Lun [1 ]
Monteverde, Frederic [2 ]
Fahrenholtz, William G. [1 ]
Hilmas, Gregory E. [1 ]
机构：
[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65049 USA
[2] Natl Res Council Italy, Inst Sci & Technol Ceram, I-48018 Faenza, RA, Italy
来源：
SCRIPTA MATERIALIA | 2021年 / 199卷
基金：
美国国家科学基金会;
关键词：
High-entropy ceramics; high-entropy borides; superhard materials; Vickers hardness; MECHANICAL-PROPERTIES; BORIDES;
D O I：
10.1016/j.scriptamat.2021.113855
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
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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页数：5
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