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Hardness of single phase high entropy carbide ceramics with different compositions

Publication ,  Journal Article
Brune, PM; Hilmas, GE; Fahrenholtz, WG; Watts, JL; Ryan, CJ; DeSalle, CM; Wolfe, DE; Curtarolo, S
Published in: Journal of Applied Physics
April 28, 2024

Five high entropy carbide ceramics, (Hf0.2,Nb0.2,Ta0.2,Ti0.2,Zr0.2)C, (Cr0.2,Hf0.2,Ta0.2,Ti0.2,Zr0.2)C, (Hf0.2,Mo0.2,Ta0.2,Ti0.2,Zr0.2)C, (Hf0.2,Ta0.2,Ti0.2,W0.2,Zr0.2)C, and (Hf0.2,Mo0.2,Ti0.2,W0.2,Zr0.2)C, were synthesized by carbothermal reduction of oxides and direct current sintering. The five high entropy carbide ceramics were determined to be nominally phase-pure with relative densities of more than 98.9% and mean grain sizes of less than 5 μm. Average Vickers hardness values ranged from 19.2 ± 0.4 GPa for (Hf0.2,Nb0.2,Ta0.2,Ti0.2,Zr0.2)C at a load of 2 kgf to 43.5 ± 0.4 GPa for (Hf0.2,Mo0.2,Ti0.2,W0.2,Zr0.2)C at a load of 0.05 kgf. Hardness generally increased with increasing the valence electron concentration and strain as measured by the Williamson-Hall analysis. However, neither correlation was conclusive enough to be a clear indicator of hardness. Instead, it was determined that a combination of effects that includes the valence electron concentration, lattice strain, and grain size all contribute to the hardness of high entropy carbide ceramics.

Duke Scholars

Published In

Journal of Applied Physics

DOI

EISSN

1089-7550

ISSN

0021-8979

Publication Date

April 28, 2024

Volume

135

Issue

16

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences
 

Citation

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Brune, P. M., Hilmas, G. E., Fahrenholtz, W. G., Watts, J. L., Ryan, C. J., DeSalle, C. M., … Curtarolo, S. (2024). Hardness of single phase high entropy carbide ceramics with different compositions. Journal of Applied Physics, 135(16). https://doi.org/10.1063/5.0198141
Brune, P. M., G. E. Hilmas, W. G. Fahrenholtz, J. L. Watts, C. J. Ryan, C. M. DeSalle, D. E. Wolfe, and S. Curtarolo. “Hardness of single phase high entropy carbide ceramics with different compositions.” Journal of Applied Physics 135, no. 16 (April 28, 2024). https://doi.org/10.1063/5.0198141.
Brune PM, Hilmas GE, Fahrenholtz WG, Watts JL, Ryan CJ, DeSalle CM, et al. Hardness of single phase high entropy carbide ceramics with different compositions. Journal of Applied Physics. 2024 Apr 28;135(16).
Brune, P. M., et al. “Hardness of single phase high entropy carbide ceramics with different compositions.” Journal of Applied Physics, vol. 135, no. 16, Apr. 2024. Scopus, doi:10.1063/5.0198141.
Brune PM, Hilmas GE, Fahrenholtz WG, Watts JL, Ryan CJ, DeSalle CM, Wolfe DE, Curtarolo S. Hardness of single phase high entropy carbide ceramics with different compositions. Journal of Applied Physics. 2024 Apr 28;135(16).

Published In

Journal of Applied Physics

DOI

EISSN

1089-7550

ISSN

0021-8979

Publication Date

April 28, 2024

Volume

135

Issue

16

Related Subject Headings

  • Applied Physics
  • 51 Physical sciences
  • 49 Mathematical sciences
  • 40 Engineering
  • 09 Engineering
  • 02 Physical Sciences
  • 01 Mathematical Sciences