High-temperature toughening in ternary medium-entropy (Ta1/3Ti1/3Zr1/3)C carbide consolidated using spark-plasma sintering

Demirskyi ,D.; Nishimura ,T; Suzuki ,T.S.; Sakka ,Y; Vasylkiv ,O.; Yoshimi ,K.

doi:10.1080/21870764.2020.1840703

Article High-temperature toughening in ternary medium-entropy (Ta1/3Ti1/3Zr1/3)C carbide consolidated using spark-plasma sintering

Demirskyi ,D. (Research Center for Functional Materials/Optical Materials Field/Ceramics Processing Group, National Institute for Materials Science) ; Nishimura ,T (Research Center for Structural Materials/Administrative Office, National Institute for Materials Science) ; Suzuki ,T.S. (Research Center for Electronic and Optical Materials/Optical Materials Field/Optical Ceramics Group, National Institute for Materials Science) ; Sakka ,Y (Research Center for Electronic and Optical Materials/Optical Materials Field/Polycrystalline Optical Material Group, National Institute for Materials Science) ; Vasylkiv ,O. (Research Center for Electronic and Optical Materials/Optical Materials Field/Polycrystalline Optical Material Group, National Institute for Materials Science) ; Yoshimi ,K. (Tohoku University, Department of Materials Science and Engineering)

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Demirskyi ,D., Nishimura ,T, Suzuki ,T.S., Sakka ,Y, Vasylkiv ,O., Yoshimi ,K.. High-temperature toughening in ternary medium-entropy (Ta1/3Ti1/3Zr1/3)C carbide consolidated using spark-plasma sintering. JOURNAL OF ASIAN CERAMIC SOCIETIES. 2020, 8 (4), . https://doi.org/10.1080/21870764.2020.1840703

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We report for the first time the effect of temperature on the mechanical properties of (Ta1/3Ti1/3Zr1/3)C carbide. Flexural strength and fracture toughness were investigated using the three-point bending technique in argon. Using commercially available carbide powders with an equimolar ratio and performing spark plasma consolidation at 1973°C, we obtained a bulk single-phase medium-entropy carbide ceramic with the lattice parameter a= 4.458 Å. The flexural strength and fracture toughness at room temperature reached on average 700 MPa and 3.2 MPa m1/2, respectively. At 1800°C, local decomposition of the medium-entropy carbide took place as a structure with a local chemical gradient was observed after high-temperature tests, which increased fracture toughness by 30% (to 4.4 MPa m1/2). © 2020 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group on behalf of The Korean Ceramic Society and The Ceramic Society of Japan.

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Creative Commons BY Attribution 4.0 International

Keyword: tantalum carbide, high-entropy ceramics, flexural strength, toughness, high-temperature materials

Date published: 2020-10-01

Publisher: Informa UK Limited

Journal:

JOURNAL OF ASIAN CERAMIC SOCIETIES vol. 8 issue. 4

Funding:

NIMS 70% AB3080, 30% AB3020

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5497

First published URL: https://doi.org/10.1080/21870764.2020.1840703

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Updated at: 2025-05-23 08:30:24 +0900

Published on MDR: 2025-05-22 16:32:07 +0900

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