Superhard high-entropy AlB2-type diboride ceramics
Superhard high-entropy AlB2-type diboride ceramics
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DOI：
10.1016/j.scriptamat.2021.113855
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发表时间：
2021-03-14
影响因子：
6
通讯作者：
Hilmas, Gregory E.
中科院分区：
文献类型：
--
作者：
Feng, Lun;Monteverde, Frederic;Hilmas, Gregory E.
采用两步法制备了六种名义纯AlB2结构的单相高熵二硼化物陶瓷，对其硬度进行了测定。大部分陶瓷的相对密度大于99.5%。维氏硬度平均值介于21.0绩点25.4绩点9.81 N的负载,而值的范围增加到33.1绩点48.3的绩点在0.49 N的负载组成,最高硬度值0.49 N的负载分别为48.3 + / - 2.3绩点(Cr0.2Hf0.2Ta0.2Ti0.2Zr0.2) b - 2和45.8 + / - 5.3绩点(Hf0.2Ta0.2Ti0.2W0.2Zr0.2) b - 2,两者都是高到足以被认为是超硬。研究表明，高熵二硼化物陶瓷是一类新型的超硬材料。(c) 2021 Acta Materialia Inc.Elsevier Ltd.出版。版权所有。
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.