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説明:

Refractory ceramic materials are critical for applications in extreme high temperature environments. Refractory high-entropy ceramics belong to this class of materials and show great potential due to their remarkable combination of properties. Traditionally, increasing compositional complexity and chemical diversity of high-entropy ceramics whilst maintaining a stable single-phase solid solution has been a primary design strategy for developing new ceramics. Here, we unveil an alternative strategy based on deviation from conventional equimolar composition towards non-equimolar composition space, enabling tuning the metastability level of the supersaturated single-phase solid solution. By employing high-temperature micromechanical testing and post-mortem microstructural characterization of refractory metal-based high-entropy nitrides, we observed the activation of an additional strengthening mechanism upon spinodal decomposition of the metastable phase into coherent cubic-phase domains exhibiting compositional modulation. This process propels the yield strength of a non-equimolar nitride at 1000 C to a staggering 6.9 GPa, that is 43% higher than the most robust equimolar nitride.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

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刊行年月日: 2025-12-27

出版者: Springer Science and Business Media LLC

掲載誌:

• Communications Materials (ISSN: 26624443) vol. 7 issue. 1 35

研究助成金:

• National Science Centre of Poland SONATINA 2 project, UMO-2018/28/C/ ST5/00476
• Foundation for Polish Science START 72.2020
• Polish National Agency for Academic Exchange PPN/BE K/2019/1/00146/U/00001
• Warsaw University of Technology 1820/74/Z09/2023
• European Union Horizon 2020 840222

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s43246-025-01047-z

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更新時刻: 2026-04-10 18:40:35 +0900

MDRでの公開時刻: 2026-04-13 10:23:12 +0900