Improved mechanical properties of Co-free high-entropy Cantor alloy: A first-principles study

Ivan Lobzenko; Daixiu Wei; Mitsuhiro Itakura; Yoshinori Shiihara; Tomohito Tsuru

Results in Materials (Mar 2023)

Improved mechanical properties of Co-free high-entropy Cantor alloy: A first-principles study

Ivan Lobzenko,
Daixiu Wei,
Mitsuhiro Itakura,
Yoshinori Shiihara,
Tomohito Tsuru

Affiliations

Ivan Lobzenko: Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Ibaraki, 319-1195, Japan
Daixiu Wei: Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Sendai, Miyagi, 980-8577, Japan
Mitsuhiro Itakura: Center for Computational Science and e-Systems, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Ibaraki, 319-1195, Japan
Yoshinori Shiihara: Graduate School of Engineering, Toyota Technological Institute, Nagoya, Aichi, 468-8511, Japan
Tomohito Tsuru: Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Ibaraki, 319-1195, Japan; Center for the Promotion of Interdisciplinary Education and Research, Elements Strategy Initiative for Structural Materials (ESISM), Kyoto University, Yoshida, Honmachi, Sakyo-ku, Kyoto, 606-8501, Japan; PRESTO, Japan Science and Technology Agency, 4-1-8 Honcho, Kawaguchi, Saitama, 332-0012, Japan; Corresponding author. Nuclear Science and Engineering Center, Japan Atomic Energy Agency, 2-4 Shirakata, Tokai-mura, Ibaraki, 319-1195, Japan.

Journal volume & issue: Vol. 17
p. 100364

Abstract

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High-entropy alloys (HEAs) have received attention because of their excellent mechanical and thermodynamic properties. A recent study revealed that Co-free face-centered cubic HEAs could improve strength and ductility, which is crucial for nuclear materials. Here we implemented first-principles calculations to explore the fundamental mechanism for enhancing the mechanical properties in Co-free Cr25Fe25Ni25Mn25 alloy. We found that the local lattice distortion of Co-free HEA was more significant than that of the well-known Cantor alloy. Furthermore, the short-range order formation in Co-free HEA caused the highly fluctuated stacking fault energy. Thus, the significant local lattice distortion and the non-uniform solid solution states comprising low- and high-stacking fault regions improve strength and ductility.

Published in Results in Materials

ISSN: 2590-048X (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Technology: Electrical engineering. Electronics. Nuclear engineering: Materials of engineering and construction. Mechanics of materials
Website: https://www.journals.elsevier.com/results-in-materials

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