Advanced Materials

Superelasticity and Shape Memory in Micro- and Nanometer-scale Pillars

Authors

  • J. San Juan,

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA)
    2. Current address: Department of Physics of Condensed Matter, Universidad del Pais Vasco, Box 644, Bilbao, 48080, Spain
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  • M. L. Nó,

    1. Department of Applied Physics II, Universidad del Pais Vasco, Box 644, Bilbao, 48080 (Spain)
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  • C. A. Schuh

    1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139 (USA)
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  • J.S.J. thanks the University of the Basque Country and the Spanish Ministry of Science and Education, for the Sabbatical license and the Mobility Grant to stay at MIT. This work was supported by the project MAT2004-03166, from the Spanish Ministry of Science and Education, and the ETORTEK-ACTIMAT-05 project of the Basque Government. C.A.S. acknowledges the support of the US Office of Naval Research, grant N00014-04-1-0669.

Abstract

Superelasticity and shape memory down to the nanometer scale are successfully demonstrated in micro- and nanometer-scale pillars of a Cu-Al-Ni shape memory alloy. Microcompression tests show superelastic behavior with recoverable strains above 5 % during more than 100 cycles. In addition, shape memory behavior with complete shape recovery at both the micro- and nanometer scales is also observed, opening the door to a new generation of smart micro and nano devices.

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