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Extremely hard and tough high entropy nitride ceramics.
- Source :
-
Scientific reports [Sci Rep] 2020 Nov 16; Vol. 10 (1), pp. 19874. Date of Electronic Publication: 2020 Nov 16. - Publication Year :
- 2020
-
Abstract
- Simultaneously hard and tough nitride ceramics open new venues for a variety of advanced applications. To produce such materials, attention is focused on the development of high-entropy ceramics, containing four or more metallic components distributed homogeneously in the metallic sublattice. While the fabrication of bulk high-entropy carbides and borides is well established, high-entropy nitrides have only been produced as thin films. Herein, we report on a newel three-step process to fabricate bulk high-entropy nitrides. The high-entropy nitride phase was obtained by exothermic combustion of mechanically-activated nanostructured metallic precursors in nitrogen and consolidated by spark plasma sintering. The fabricated bulk high-entropy nitride (Hf <subscript>0.2</subscript> Nb <subscript>0.2</subscript> Ta <subscript>0.2</subscript> Ti <subscript>0.2</subscript> Zr <subscript>0.2</subscript> )N demonstrates outstanding hardness (up to 33 GPa) and fracture toughness (up to 5.2 MPa∙m <superscript>1/2</superscript> ), significantly surpassing expected values from mixture rules, as well as all other reported binary and high-entropy ceramics and can be used for super-hard coatings, structural materials, optics, and others. The obtained results illustrate the scalable method to produce bulk high-entropy nitrides with the new benchmark properties.
Details
- Language :
- English
- ISSN :
- 2045-2322
- Volume :
- 10
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Scientific reports
- Publication Type :
- Academic Journal
- Accession number :
- 33199795
- Full Text :
- https://doi.org/10.1038/s41598-020-76945-y