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Science 18 April 2003:
Vol. 300. no. 5618, pp. 464 - 467
DOI: 10.1126/science.1081957
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Reports

Multifunctional Alloys Obtained via a Dislocation-Free Plastic Deformation Mechanism

Takashi Saito,1* Tadahiko Furuta,1 Jung-Hwan Hwang,1 Shigeru Kuramoto,1 Kazuaki Nishino,1 Nobuaki Suzuki,1 Rong Chen,1 Akira Yamada,1 Kazuhiko Ito,1 Yoshiki Seno,1 Takamasa Nonaka,1 Hideaki Ikehata,1 Naoyuki Nagasako,1 Chihiro Iwamoto,2 Yuuichi Ikuhara,2 Taketo Sakuma3

We describe a group of alloys that exhibit "super" properties, such as ultralow elastic modulus, ultrahigh strength, super elasticity, and super plasticity, at room temperature and that show Elinvar and Invar behavior. These "super" properties are attributable to a dislocation-free plastic deformation mechanism. In cold-worked alloys, this mechanism forms elastic strain fields of hierarchical structure that range in size from the nanometer scale to several tens of micrometers. The resultant elastic strain energy leads to a number of enhanced material properties.

1 Toyota Central Research and Development Laboratories, Incorporated, Nagakute Aichi, 480-1192 Japan.
2 Institute of Engineering Innovation, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-8656 Japan.
3 Graduate School of Frontier Sciences, University of Tokyo, Hongo, Bunkyo-ku, Tokyo, 113-0033 Japan.

* To whom correspondence should be addressed. E-mail: saito{at}mosk.tytlabs.co.jp

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Science. ISSN 0036-8075 (print), 1095-9203 (online)