A super-hard high entropy boride containing Hf, Mo, Ti, V, and W

Suzana Filipovic; Nina Obradovic; Greg E. Hilmas; William G. Fahrenholtz; Donald W. Brenner; Jon Paul Maria; Douglas E. Wolfe; Eva Zurek; Xiomara Campilongo; Stefano Curtarolo

doi:10.1111/jace.19795

A super-hard high entropy boride containing Hf, Mo, Ti, V, and W

Suzana Filipovic, Nina Obradovic, Greg E. Hilmas, William G. Fahrenholtz, Donald W. Brenner, Jon Paul Maria, Douglas E. Wolfe, Eva Zurek, Xiomara Campilongo, Stefano Curtarolo

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

Super-hard (Hf,Mo,Ti,V,W)B₂ was synthesized by boro-carbothermal reduction and densified by spark plasma sintering. This composition was produced for the first time as a single-phase ceramic in the present research. The optimized ceramic had a single hexagonal AlB₂-type crystalline phase with a grain size of 3.8 µm and homogeneous distribution of the constituent metals. The Vickers hardness exhibited the indentation size effect, increasing from 27 GPa at a load of 9.8 N to as high as 66 GPa at a load of 0.49 N. This is the highest hardness reported to date for high entropy boride ceramics.

Original language	English (US)
Pages (from-to)	4430-4435
Number of pages	6
Journal	Journal of the American Ceramic Society
Volume	107
Issue number	7
DOIs	https://doi.org/10.1111/jace.19795
State	Published - Jul 2024

All Science Journal Classification (ASJC) codes

Ceramics and Composites
Materials Chemistry

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10.1111/jace.19795

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title = "A super-hard high entropy boride containing Hf, Mo, Ti, V, and W",

abstract = "Super-hard (Hf,Mo,Ti,V,W)B2 was synthesized by boro-carbothermal reduction and densified by spark plasma sintering. This composition was produced for the first time as a single-phase ceramic in the present research. The optimized ceramic had a single hexagonal AlB2-type crystalline phase with a grain size of 3.8 µm and homogeneous distribution of the constituent metals. The Vickers hardness exhibited the indentation size effect, increasing from 27 GPa at a load of 9.8 N to as high as 66 GPa at a load of 0.49 N. This is the highest hardness reported to date for high entropy boride ceramics.",

author = "Suzana Filipovic and Nina Obradovic and Hilmas, {Greg E.} and Fahrenholtz, {William G.} and Brenner, {Donald W.} and Maria, {Jon Paul} and Wolfe, {Douglas E.} and Eva Zurek and Xiomara Campilongo and Stefano Curtarolo",

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year = "2024",

month = jul,

doi = "10.1111/jace.19795",

language = "English (US)",

volume = "107",

pages = "4430--4435",

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T1 - A super-hard high entropy boride containing Hf, Mo, Ti, V, and W

AU - Filipovic, Suzana

AU - Obradovic, Nina

AU - Hilmas, Greg E.

AU - Fahrenholtz, William G.

AU - Brenner, Donald W.

AU - Maria, Jon Paul

AU - Wolfe, Douglas E.

AU - Zurek, Eva

AU - Campilongo, Xiomara

AU - Curtarolo, Stefano

PY - 2024/7

Y1 - 2024/7

N2 - Super-hard (Hf,Mo,Ti,V,W)B2 was synthesized by boro-carbothermal reduction and densified by spark plasma sintering. This composition was produced for the first time as a single-phase ceramic in the present research. The optimized ceramic had a single hexagonal AlB2-type crystalline phase with a grain size of 3.8 µm and homogeneous distribution of the constituent metals. The Vickers hardness exhibited the indentation size effect, increasing from 27 GPa at a load of 9.8 N to as high as 66 GPa at a load of 0.49 N. This is the highest hardness reported to date for high entropy boride ceramics.

AB - Super-hard (Hf,Mo,Ti,V,W)B2 was synthesized by boro-carbothermal reduction and densified by spark plasma sintering. This composition was produced for the first time as a single-phase ceramic in the present research. The optimized ceramic had a single hexagonal AlB2-type crystalline phase with a grain size of 3.8 µm and homogeneous distribution of the constituent metals. The Vickers hardness exhibited the indentation size effect, increasing from 27 GPa at a load of 9.8 N to as high as 66 GPa at a load of 0.49 N. This is the highest hardness reported to date for high entropy boride ceramics.

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A super-hard high entropy boride containing Hf, Mo, Ti, V, and W

Abstract

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