Superhard high-entropy AlB2-type diboride ceramics

被引：94

作者：

Feng, Lun ^{[1
]}

Monteverde, Frederic ^{[2
]}

Fahrenholtz, William G. ^{[1
]}

Hilmas, Gregory E. ^{[1
]}

机构：

[1] Missouri Univ Sci & Technol, Dept Mat Sci & Engn, Rolla, MO 65049 USA

[2] Natl Res Council Italy, Inst Sci & Technol Ceram, I-48018 Faenza, RA, Italy

来源：

SCRIPTA MATERIALIA | 2021年 / 199卷

基金：

美国国家科学基金会;

关键词：

High-entropy ceramics; high-entropy borides; superhard materials; Vickers hardness; MECHANICAL-PROPERTIES; BORIDES;

D O I：

10.1016/j.scriptamat.2021.113855

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Hardness was measured for six different nominally pure and single-phase high-entropy diboride ceramics with the AlB2 structure that were produced by a two-step process. Most of the ceramics had relative densities greater than 99.5%. Vickers hardness average values ranged from 21.0 GPa to 25.4 GPa at a load of 9.81 N, while values increased to the range of 33.1 GPa to 48.3 GPa at a load of 0.49 N. Among the compositions, the highest hardness values at a load of 0.49 N were 48.3 +/- 2.3 GPa for (Cr0.2Hf0.2Ta0.2Ti0.2Zr0.2)B-2 and 45.8 +/- 5.3 GPa for (Hf0.2Ta0.2Ti0.2W0.2Zr0.2)B-2, both of which are high enough to be considered superhard. The present study demonstrated that high-entropy diboride ceramics are a new class of superhard materials. (c) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

引用

页数：5

共 32 条

[1]

Feng L., 2020, ANNU REV MATER RES

[2] Effect of Nb content on the phase composition, densification, microstructure, and mechanical properties of high-entropy boride ceramics [J].

Feng, Lun ;

Fahrenholtz, William G. ;

Hilmas, Gregory E. ;

Monteverde, Frederic .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2021, 41 (01) :92-100

[3] Processing of dense high-entropy boride ceramics [J].

Feng, Lun ;

Fahrenholtz, William G. ;

Hilmas, Gregory E. .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2020, 40 (12) :3815-3823

[4] Two-step synthesis process for high-entropy diboride powders [J].

Feng, Lun ;

Fahrenholtz, William G. ;

Hilmas, Gregory E. .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2020, 103 (02) :724-730

[5] Synthesis of a Fine (Ta0.8,Hf0.2)C Powder from Carbide or Oxide Powder Mixtures [J].

Feng, Lun ;

Kim, Jin-Myung ;

Lee, Sea-Hoon ;

Park, Se-Jeong .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2016, 99 (04) :1129-1132

[6] The mechanical and strength properties of diamond [J].

Field, J. E. .

REPORTS ON PROGRESS IN PHYSICS, 2012, 75 (12)

[7] Thermal conductivity and hardness of three single-phase high-entropy metal diborides fabricated by borocarbothermal reduction and spark plasma sintering [J].

Gild, Joshua ;

Wright, Andrew ;

Quiambao-Tomko, Kathleen ;

Qin, Mingde ;

Tomko, John A. ;

bin Hoque, Md Shafkat ;

Braun, Jeffrey L. ;

Bloomfield, Blake ;

Martinez, Daniel ;

Harrington, Tyler ;

Vecchio, Kenneth ;

Hopkins, Patrick E. ;

Luo, Jian .

CERAMICS INTERNATIONAL, 2020, 46 (05) :6906-6913

[8] High-Entropy Metal Diborides: A New Class of High-Entropy Materials and a New Type of Ultrahigh Temperature Ceramics [J].

Gild, Joshua ;

Zhang, Yuanyao ;

Harrington, Tyler ;

Jiang, Sicong ;

Hu, Tao ;

Quinn, Matthew C. ;

Mellor, William M. ;

Zhou, Naixie ;

Vecchio, Kenneth ;

Luo, Jian .

SCIENTIFIC REPORTS, 2016, 6

[9] A new superhard material:: Osmium diboride OsB2 [J].

Hebbache, M. ;

Stuparevic, L. ;

Zivkovic, D. .

SOLID STATE COMMUNICATIONS, 2006, 139 (05) :227-231

[10] Synthesis of chromium borides by solid-state reaction between chromium oxide (III) and amorphous boron powders [J].

Iizumi, K ;

Kudaka, K ;

Okada, S .

JOURNAL OF THE CERAMIC SOCIETY OF JAPAN, 1998, 106 (09) :931-934

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