TY - JOUR
T1 - A lightweight shape-memory magnesium alloy
AU - Ogawa, Yukiko
AU - Ando, Daisuke
AU - Sutou, Yuji
AU - Koike, Junichi
N1 - Funding Information:
We thank N. Ueshima and K. Oikawa (Tohoku University, Japan) for help with the tensile testing experiment; X. Xu, T. Omori, and R. Kainuma (Tohoku University, Japan) for help with the XRD and Physical Property Measurement System experiments; K. Kobayashi and T. Miyazaki (Tohoku University, Japan) for help with TEM measurements; and K. Yoshimi and K. Ishida (Tohoku University, Japan) for fruitful discussions. This work was supported by the Japan Society for the Promotion of Science KAKENHI, Grant-in-Aid for Young Scientists (A), grant no. 15H05549, and Tohoku University Division for International Advanced Research and Education. The present authors are inventors on Japanese patent application no. 2015-201830, applied for by Tohoku University. The data are available from the corresponding authors upon request.
Publisher Copyright:
Copyright © 2016 by the American Association for the Advancement of Science.
PY - 2016/7/22
Y1 - 2016/7/22
N2 - Shape-memoryalloys (SMAs), which display shape recovery upon heating, aswell as superelasticity, offermany technological advantages in various applications. Those distinctive behaviors have been observed in many polycrystalline alloy systems such as nickel titantium (TiNi)-, copper-, iron-, nickel-, cobalt-, and Ti-based alloys but not in lightweight alloys such as magnesium (Mg) and aluminum alloys. Here we present aMg SMA showing superelasticity of 4.4% at -150°C and shape recovery upon heating. The shape-memory properties are caused by reversible martensitic transformation. This Mg alloy includes lightweight scandium, and its density is about 2 grams per cubic centimeter, which is one-third less than that of practical TiNi SMAs. This finding raises the potential for development and application of lightweight SMAs across a number of industries.
AB - Shape-memoryalloys (SMAs), which display shape recovery upon heating, aswell as superelasticity, offermany technological advantages in various applications. Those distinctive behaviors have been observed in many polycrystalline alloy systems such as nickel titantium (TiNi)-, copper-, iron-, nickel-, cobalt-, and Ti-based alloys but not in lightweight alloys such as magnesium (Mg) and aluminum alloys. Here we present aMg SMA showing superelasticity of 4.4% at -150°C and shape recovery upon heating. The shape-memory properties are caused by reversible martensitic transformation. This Mg alloy includes lightweight scandium, and its density is about 2 grams per cubic centimeter, which is one-third less than that of practical TiNi SMAs. This finding raises the potential for development and application of lightweight SMAs across a number of industries.
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U2 - 10.1126/science.aaf6524
DO - 10.1126/science.aaf6524
M3 - Article
AN - SCOPUS:84979538863
SN - 0036-8075
VL - 353
SP - 368
EP - 370
JO - Science
JF - Science
IS - 6297
ER -