Prediction of Face-Centered Cubic Single-Phase Formation for Non-Equiatomic Cr–Mn–Fe–Co–Ni High-Entropy Alloys Using Valence Electron Concentration and Mean-Square Atomic Displacement

Kodai Niitsu; Makoto Asakura; Koretaka Yuge; Haruyuki Inui

doi:10.2320/matertrans.MT-M2020144

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Prediction of Face-Centered Cubic Single-Phase Formation for Non-Equiatomic Cr–Mn–Fe–Co–Ni High-Entropy Alloys Using Valence Electron Concentration and Mean-Square Atomic Displacement

Kodai Niitsu, Makoto Asakura, Koretaka Yuge, Haruyuki Inui

著者情報

キーワード: high-entropy alloys, superalloys, atomic displacement, phase diagram, phase transformations

ジャーナルフリー早期公開

論文ID: MT-M2020144

DOI https://doi.org/10.2320/matertrans.MT-M2020144

この記事には本公開記事があります。

The final version of this article is now available: Vol. 61 (2020), No. 9 pp. 1874-1880

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抄録

We have investigated the face-centered cubic (FCC) single-phase formability of non-equiatomic Cr–Mn–Fe–Co–Ni HEAs as well as equiatomic derivative medium/high-entropy alloys (M/HEAs) considering their valence electron concentration (VEC) and mean-square atomic displacement (MSAD). While VEC remains the most decisive parameter to predict phase formation, MSAD can be a complementary parameter that modifies the VEC boundary. Multiplicity of constituent elements was beneficial to accommodate a larger MSAD, which resulted in a downward shift of the VEC boundary for the FCC single phase. This offers information about the correlations between the phase formation preference, VEC, and MSAD of M/HEAs with various compositions.

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