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Reactive consolidation of medium entropy diboride in the ZrB2–TaB2–NbB2 system was performed by spark plasma sintering of diboride powders at 2000 °C. The 3:2:1 ratio between Zr, Ta, and Nb showed the highest specific strength at room temperature during the initial screening of the mechanical properties. The flexural strength gradually decreased from 700 ± 42 MPa at RT to 518 ± 30 MPa at 1600 °C with the Weibull parameter exceeding 15. Diborides with an equimolar composition did not show a maximum in their strength, fracture toughness or hardness.

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• In Copyright
  

Keyword: diborides, high-temperature strength, high-entropy ceramic, Reactive SPS

Date published: 2022-11-16

Publisher: Elsevier BV

Journal:

• Scripta Materialia (ISSN: 13596462) vol. 225 115170

Funding:

• NIMS PA3030 (粉体・セラミックス 結晶・界面の階層的構造制御による機能顕在化のための研究 30)
• NIMS PA5180 (セラミックスプロセッシング - 70 )

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4960

First published URL: https://doi.org/10.1016/j.scriptamat.2022.115170

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Updated at: 2024-11-21 16:31:55 +0900

Published on MDR: 2024-11-21 16:31:57 +0900