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Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires

Appl. Phys. Lett. 95, 171906 (2009); doi:10.1063/1.3257372

Published 29 October 2009

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Ying Chen,1 Xuexi Zhang,2 David C. Dunand,2 and Christopher A. Schuh1
1Department of Materials Science and Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA
2Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, USA
We report a strategy to significantly improve the ductility and achieve large superelastic and shape memory strains in polycrystalline Cu–Al–Ni shape memory alloys that are normally brittle. We use a liquid-phase (Taylor) wire forming process to obtain microwires of 10–150  µm diameter with a bamboo grain structure. The reduction of grain boundary area, removal of triple junctions, and introduction of a high specific surface area in the wire decrease constraints on the martensitic transformation, and permit both superelasticity and stress-assisted two-way shape memory with recoverable strains as high as 6.8%. ©2009 American Institute of Physics
History: Received 12 September 2009; accepted 7 October 2009; published 29 October 2009
Permalink: http://link.aip.org/link/?APPLAB/95/171906/1
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KEYWORDS and PACS

Keywords
PACS
  • 81.40.Lm
    Deformation, plasticity, and creep
  • 62.20.fg
    Shape-memory effect; yield stress; superelasticity
  • 64.70.kd
    Solid-solid transitions in metals and alloys
  • 61.72.Mm
    Grain and twin boundaries
  • 81.40.Jj
    Elasticity and anelasticity, stress-strain relations
  • 62.20.fk
    Ductility and malleability of solids
  • 81.30.Kf
    Martensitic transformations
  • YEAR: 2009

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PUBLICATION DATA

ISSN:
0003-6951 (print)   1077-3118 (online)
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