Article Determination of the Entire Existence Composition Range of CrMnFeCoNi High-Entropy Alloys Using Sintered Diffusion Multiple Method

Ryuta Yurishima ; Ayako Ikeda SAMURAI ORCID (National Institute for Materials Science) ; Teruyuki Ikeda ORCID

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Ryuta Yurishima, Ayako Ikeda, Teruyuki Ikeda. Determination of the Entire Existence Composition Range of CrMnFeCoNi High-Entropy Alloys Using Sintered Diffusion Multiple Method. Materials. 2025, 18 (2), 295. https://doi.org/10.3390/ma18020295

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(abstract)

Sintered diffusion multiple (SDM) method, which have been developed in our research group, has been applied to determine the existence composition range of the CrMnFeCoNi high-entropy alloy stereoscopically and continuously over the mostly entire range. Samples were prepared by sintering mixed elemental powders and annealed at 970°C or 800°C. Several hundreds of thousands of points were analyzed at random within the samples for chemical compositions with electron probe micro analysis. With the idea that ideally only chemical compositions of existing phases at the temperature of annealing are obtained, the compositional data thus obtained were analyzed to estimate phase boundaries of the high-entropy phase including the Cantor alloy composition assuming local equilibrium within the samples. The analysis includes the determination of point densities and their slopes in the space of chemical composition. The results are shown in the tetrahedral compositional space with vertices for Cr, Mn, and Fe atomic fractions and sum of Co and Ni fractions. One of the features found in this work is that the high-entropy phase has a wide compositional range in the Fe-CrMnCoNi direction. The estimated phase boundary compositions are found to be approximately in good agreement with those obtained using samples prepared by the conventional method, where samples with uniform compositions are equilibrated by annealing and the compositions of their existing phases are analyzed with EPMA. Thus, the sintered diffusion multiple method is effective in providing an overview of quinary phase diagrams.

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Keyword: high-entropy alloys, phase diagram, sintered diffusion multiple method

Date published: 2025-01-10

Publisher: MDPI AG

Journal:

  • Materials (ISSN: 19961944) vol. 18 issue. 2 295

Funding:

  • Grant-in-Aid for Scientific Research on Innovative Areas from JSPS KAKENHI 19H05165
  • Grant-in-Aid for Scientific Research on Innovative Areas from JSPS KAKENHI 2024-095
  • NIMS Joint Research Hub Program 19H05165
  • NIMS Joint Research Hub Program 2024-095

Manuscript type: Publisher's version (Version of record)

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First published URL: https://doi.org/10.3390/ma18020295

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Updated at: 2025-12-09 16:30:26 +0900

Published on MDR: 2025-12-09 12:30:33 +0900

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