Article
Superhard High-Entropy AlB₂-Type Diboride Ceramics
Scripta Materialia
Abstract
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)B2 and 45.8 ± 5.3 GPa for (Hf0.2Ta0.2Ti0.2W0.2Zr0.2)B2, 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.
Department(s)
Materials Science and Engineering
Keywords and Phrases
- High-Entropy Borides,
- High-Entropy Ceramics,
- Superhard Materials,
- Vickers Hardness
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 Acta Materialia, All rights reserved.
Publication Date
7-1-2021
Publication Date
01 Jul 2021
Disciplines
Citation Information
Lun Feng, Frédéric Monteverde, William Fahrenholtz and Greg Hilmas. "Superhard High-Entropy AlB₂-Type Diboride Ceramics" Scripta Materialia Vol. 199 (2021) ISSN: 1359-6462 Available at: http://works.bepress.com/greg-hilmas/264/
National Science Foundation, Grant CMMI-1902069