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The effect of chemical element on hardness in high-entropy transition metal diboride ceramics.
- Source :
-
Journal of the European Ceramic Society . Nov2023, Vol. 43 Issue 14, p5774-5781. 8p. - Publication Year :
- 2023
-
Abstract
- The relationship between the chemical elements of high-entropy boride (HEB) ceramics and their hardness is important for the prediction of high-hardness HEB ceramics. In this work, by designing four HEB ceramics with different chemical elements, the effect of lattice parameter difference factor (δ, represents the difference-degree in lattice parameters among the five individual constitute diborides) on phase composition and lattice-distortion, and the effect of rule of mixture (ROM) average hardness and lattice-distortion on HEB ceramics hardness were studied. The results indicated that, as δ value increases, more severe lattice-distortion occurs inside the HEB ceramics, and a single solid-solution is difficult to be formed. Furthermore, lattice-distortion and the ROM average hardness codetermine the HEB ceramics hardness. The greater lattice-distortion brings about significantly higher hardness for HEB ceramics than their ROM average hardness. Among the four HEBs, (Hf 0.2 Zr 0.2 Ta 0.2 V 0.2 Nb 0.2)B 2 exhibits the high hardness of 26 GPa measured using a load of 9.8 N. [ABSTRACT FROM AUTHOR]
- Subjects :
- *TRANSITION metals
*CERAMICS
*HARDNESS
*CHEMICAL elements
*LATTICE constants
Subjects
Details
- Language :
- English
- ISSN :
- 09552219
- Volume :
- 43
- Issue :
- 14
- Database :
- Academic Search Index
- Journal :
- Journal of the European Ceramic Society
- Publication Type :
- Academic Journal
- Accession number :
- 164964747
- Full Text :
- https://doi.org/10.1016/j.jeurceramsoc.2023.06.003