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Phase stability and mechanical properties of novel high entropy transition metal carbides

Publication ,  Journal Article
Harrington, TJ; Gild, J; Sarker, P; Toher, C; Rost, CM; Dippo, OF; McElfresh, C; Kaufmann, K; Marin, E; Borowski, L; Hopkins, PE; Luo, J ...
Published in: Acta Materialia
March 1, 2019

Twelve different equiatomic five-metal carbides of group IVB, VB, and VIB refractory transition metals are synthesized via high-energy ball milling and spark plasma sintering. Implementation of a newly developed ab initio entropy descriptor aids in selection of candidate compositions for synthesis of high entropy and entropy stabilized carbides. Phase formation and composition uniformity are analyzed via XRD, EDS, S/TEM-EDS, and EXAFS. Nine of the twelve candidates form true single-phase materials with the rocksalt (B1) structure when sintered at 2473 K and can therefore be investigated as high entropy carbides (HECs). The composition (V 0.2 Nb 0.2 Ta 0.2 Mo 0.2 W 0.2 )C is presented as a likely candidate for further investigation as an entropy stabilized carbide. Seven of the carbides are examined for mechanical properties via nanoindentation. The HECs show significantly enhanced hardness when compared to a rule of mixtures average of the constituent binary carbides and to the highest hardness of the binary constituents. The mechanical properties are correlated to the electronic structure of the solid solutions, offering a future route to tunability of the mechanical properties of carbide ceramics via exploration of a new complex composition space.

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Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

March 1, 2019

Volume

166

Start / End Page

271 / 280

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics
 

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Harrington, T. J., Gild, J., Sarker, P., Toher, C., Rost, C. M., Dippo, O. F., … Vecchio, K. S. (2019). Phase stability and mechanical properties of novel high entropy transition metal carbides. Acta Materialia, 166, 271–280. https://doi.org/10.1016/j.actamat.2018.12.054
Harrington, T. J., J. Gild, P. Sarker, C. Toher, C. M. Rost, O. F. Dippo, C. McElfresh, et al. “Phase stability and mechanical properties of novel high entropy transition metal carbides.” Acta Materialia 166 (March 1, 2019): 271–80. https://doi.org/10.1016/j.actamat.2018.12.054.
Harrington TJ, Gild J, Sarker P, Toher C, Rost CM, Dippo OF, et al. Phase stability and mechanical properties of novel high entropy transition metal carbides. Acta Materialia. 2019 Mar 1;166:271–80.
Harrington, T. J., et al. “Phase stability and mechanical properties of novel high entropy transition metal carbides.” Acta Materialia, vol. 166, Mar. 2019, pp. 271–80. Scopus, doi:10.1016/j.actamat.2018.12.054.
Harrington TJ, Gild J, Sarker P, Toher C, Rost CM, Dippo OF, McElfresh C, Kaufmann K, Marin E, Borowski L, Hopkins PE, Luo J, Curtarolo S, Brenner DW, Vecchio KS. Phase stability and mechanical properties of novel high entropy transition metal carbides. Acta Materialia. 2019 Mar 1;166:271–280.
Journal cover image

Published In

Acta Materialia

DOI

ISSN

1359-6454

Publication Date

March 1, 2019

Volume

166

Start / End Page

271 / 280

Related Subject Headings

  • Materials
  • 5104 Condensed matter physics
  • 4017 Mechanical engineering
  • 4016 Materials engineering
  • 0913 Mechanical Engineering
  • 0912 Materials Engineering
  • 0204 Condensed Matter Physics