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Research Article | Open Access

Ultrafine-grained high-entropy zirconates with superior mechanical and thermal properties

Mengdong Maa,b,1, Yangjie Hana,1, Zhisheng Zhaob, Jing Fengc, Yanhui Chua( )
School of Materials Science and Engineering, South China University of Technology, Guangzhou, 510641, China
Center for High Pressure Science (CHiPS), State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao, 066004, China
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming, 650093, China

1 These authors contribute equally to this article.]]>

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Graphical Abstract

Abstract

Ultrafine-grained (Sm0.2Gd0.2Dy0.2Er0.2Yb0.2)2Zr2O7 high-entropy zirconates with single fluorite structure have been fabricated by high-pressure sintering of the self-synthesized nanopowders for the first time. The as-sintered samples exhibit a good microstructure with a grain size of 220 nm and a relative density of 96.8%, which yield excellent comprehensive mechanical properties with a high Vickers hardness of 12.5 GPa and a high fracture toughness of 3.4 MPa·m1/2. In addition, the as-sintered samples possess a good thermostability with the grain growth rate of 30 nm/h, and a low thermal conductivity of 1.57 W·m−1·℃−1 at room temperature. The superior mechanical and thermal properties are primarily attributed to the “high-entropy” and grain-refinement effects and good interface bonding.

Keywords

Thermal conductivityHigh-entropy ceramicsMechanical propertiesZirconates

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Journal of Materiomics
Volume 9 Issue 2,
March 2023
Pages 370-377
DOI: 10.1016/j.jmat.2022.09.014
Cite this article:
Ma M, Han Y, Zhao Z, et al. Ultrafine-grained high-entropy zirconates with superior mechanical and thermal properties. Journal of Materiomics, 2023, 9(2): 370-377. https://doi.org/10.1016/j.jmat.2022.09.014

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Received: 24 July 2022
Revised: 19 September 2022
Accepted: 25 September 2022
Published: 17 October 2022
© 2022 The Authors.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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