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Phase decomposition can effectively enhance the mechanical properties of carbide ceramics and can overcome the difficulty of enhancing the mechanical properties of single-phase multicomponent carbide ceramics. In this work, a series of nonstoichiometric (TiZrVNb)Cx ceramics were prepared by spark plasma sintering (SPS) at different temperatures. The effects of the carbon content on the phase composition, microstructure evolution, and mechanical properties were investigated in detail. Phase decomposition occurred with decreasing carbon content. Two different solid solutions of (Ti,V)-rich and Zr-rich phases formed from the decomposition of equimolar single-phase solid solutions, namely, the Zr-poor phase and Zr-rich phase, respectively. The distribution of Nb element is relatively uniform. The semicoherent interfaces between the Zr-poor phase and the Zr-rich phase can harden and strengthen effectively under the synergistic effect of grain refinement. Ceramics with phase decomposition structures have apparent advantages compared to single-phase high-entropy carbides. This work provides an important train of thought for the microstructure tailoring and properties optimization of multi-component carbide ceramics.


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Phase transition of multi-component (TiZrVNb)C ceramics—Part I: Phase decomposition induced by carbon content

Show Author's information Qingyi Kong1,2Rao Zhang3Lei Chen1,2,4( )Sijia Huo1,2( )Wenyu Lu1,2Yujin Wang1,2Boxin Wei3Yu Zhou1,2
Institute for Advanced Ceramics, School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150080, China
Key Laboratory of Advanced Structure‒Function Integrated Materials and Green Manufacturing Technology, Harbin Institute of Technology, Harbin 150001, China
School of Materials Science and Chemical Engineering, Harbin University of Science and Technology, Harbin 150001, China
National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China

Abstract

Phase decomposition can effectively enhance the mechanical properties of carbide ceramics and can overcome the difficulty of enhancing the mechanical properties of single-phase multicomponent carbide ceramics. In this work, a series of nonstoichiometric (TiZrVNb)Cx ceramics were prepared by spark plasma sintering (SPS) at different temperatures. The effects of the carbon content on the phase composition, microstructure evolution, and mechanical properties were investigated in detail. Phase decomposition occurred with decreasing carbon content. Two different solid solutions of (Ti,V)-rich and Zr-rich phases formed from the decomposition of equimolar single-phase solid solutions, namely, the Zr-poor phase and Zr-rich phase, respectively. The distribution of Nb element is relatively uniform. The semicoherent interfaces between the Zr-poor phase and the Zr-rich phase can harden and strengthen effectively under the synergistic effect of grain refinement. Ceramics with phase decomposition structures have apparent advantages compared to single-phase high-entropy carbides. This work provides an important train of thought for the microstructure tailoring and properties optimization of multi-component carbide ceramics.

Keywords: mechanical properties, microstructure evolution, multicomponent ceramics, phase decomposition, nontoichiometry

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Publication history

Received: 08 January 2024
Revised: 28 March 2024
Accepted: 30 March 2024
Published: 28 May 2024
Issue date: May 2024

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© The Author(s) 2024.

Acknowledgements

Acknowledgements

Financial support from the National Key R&D Program of China (2021YFB3701400), the National Natural Science Foundation of China (Nos. 52032002, 52372060, 51972081, and U22A20128), the National Safety Academic Foundation (No. U2130103), China Postdoctoral Science Foundation (No. 2023M730839), Heilongjiang Postdoctoral Fund (No. LBH-Z22025), the National Key Laboratory of Precision Hot Processing of Metals (No. 61429092300305), and Heilongjiang Touyan Team Program are gratefully acknowledged. The authors thank Professor Suk-Joong L. Kang (Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Republic of Korea) for his assistance in editing.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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