TY - JOUR
T1 - A strategy of designing high-entropy alloys with high-temperature shape memory effect
AU - Lee, Je In
AU - Tsuchiya, Koichi
AU - Tasaki, Wataru
AU - Oh, Hyun Seok
AU - Sawaguchi, Takahiro
AU - Murakami, Hideyuki
AU - Hiroto, Takanobu
AU - Matsushita, Yoshitaka
AU - Park, Eun Soo
N1 - Funding Information:
The research was supported in part by a Grant-in-Aid for Scientific Research on Innovative Area, “High-Entropy Alloys-Science of New Class of Materials Based on Elemental Multiplicity and Heterogeneity”, through MEXT, Japan (contract no. 18H05451). E.S.P. was supported by the National Research Foundation of Korea grant funded by the Korean government (Ministry of Science and ICT) (NRF-2018M3A7B8060601) and Institute of Engineering Research at Seoul National University, Korea. The authors would like to thank the Materials Manufacturing and Engineering Station in NIMS for materials processing, Mr. Kono, Ms. Takano, and Ms. Nakajima in the ICYS office for the continued assistance.
Publisher Copyright:
© 2019, The Author(s).
PY - 2019/12/1
Y1 - 2019/12/1
N2 - 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.
AB - 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.
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U2 - 10.1038/s41598-019-49529-8
DO - 10.1038/s41598-019-49529-8
M3 - Article
C2 - 31511574
AN - SCOPUS:85072128442
SN - 2045-2322
VL - 9
JO - Scientific Reports
JF - Scientific Reports
IS - 1
M1 - 13140
ER -