A strategy of designing high-entropy alloys with high-temperature shape memory effect

Je In Lee, Koichi Tsuchiya, Wataru Tasaki, Hyun Seok Oh, Takahiro Sawaguchi, Hideyuki Murakami, Takanobu Hiroto, Yoshitaka Matsushita, Eun Soo Park

研究成果: Article

1 引用 (Scopus)

抄録

Shape memory effect, the ability to recover a pre-deformed shape on heating, results from a reversible martensitic transformation between austenite and martensite phases. Here, we demonstrate a strategy of designing high-entropy alloys (HEAs) with high-temperature shape memory effect in the CrMnFeCoNi alloy system. First, we calculate the difference in Gibbs free energy between face-centered-cubic (FCC) and hexagonal-close-packed (HCP) phases, and find a substantial increase in thermodynamic equilibrium temperature between the FCC and HCP phases through composition tuning, leading to thermally- and stress-induced martensitic transformations. As a consequence, the shape recovery temperature in non-equiatomic CrMnFeCoNi alloys can be increased to 698 K, which is much higher than that of conventional shape memory alloys (SMAs) and comparable to that of B2-based multi-component SMAs containing noble metals (Pd, Pt, etc.) or refractory metals (Zr, Hf, etc.). This result opens a vast field of applications of HEAs as a novel class of cost-effective high-temperature SMAs.

元の言語English
記事番号13140
ジャーナルScientific reports
9
発行部数1
DOI
出版物ステータスPublished - 2019 12 1

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Entropy
Temperature
Metals
Aptitude
Thermodynamics
Heating
Costs and Cost Analysis

ASJC Scopus subject areas

  • General

これを引用

Lee, J. I., Tsuchiya, K., Tasaki, W., Oh, H. S., Sawaguchi, T., Murakami, H., ... Park, E. S. (2019). A strategy of designing high-entropy alloys with high-temperature shape memory effect. Scientific reports, 9(1), [13140]. https://doi.org/10.1038/s41598-019-49529-8

A strategy of designing high-entropy alloys with high-temperature shape memory effect. / Lee, Je In; Tsuchiya, Koichi; Tasaki, Wataru; Oh, Hyun Seok; Sawaguchi, Takahiro; Murakami, Hideyuki; Hiroto, Takanobu; Matsushita, Yoshitaka; Park, Eun Soo.

:: Scientific reports, 巻 9, 番号 1, 13140, 01.12.2019.

研究成果: Article

Lee, JI, Tsuchiya, K, Tasaki, W, Oh, HS, Sawaguchi, T, Murakami, H, Hiroto, T, Matsushita, Y & Park, ES 2019, 'A strategy of designing high-entropy alloys with high-temperature shape memory effect', Scientific reports, 巻. 9, 番号 1, 13140. https://doi.org/10.1038/s41598-019-49529-8
Lee, Je In ; Tsuchiya, Koichi ; Tasaki, Wataru ; Oh, Hyun Seok ; Sawaguchi, Takahiro ; Murakami, Hideyuki ; Hiroto, Takanobu ; Matsushita, Yoshitaka ; Park, Eun Soo. / A strategy of designing high-entropy alloys with high-temperature shape memory effect. :: Scientific reports. 2019 ; 巻 9, 番号 1.
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