Shape memory and superelasticity in polycrystalline Cu-Al-Ni microwires
Author(s)
Chen, Ying; Zhang, Xuexi; Dunand, David C.; Schuh, Christopher A.
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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%.
Date issued
2009-10Department
Massachusetts Institute of Technology. Department of Materials Science and EngineeringJournal
Applied Physics Letters
Publisher
American Institute of Physics
Citation
Chen, Ying et al. “Shape memory and superelasticity in polycrystalline Cu–Al–Ni microwires.” Applied Physics Letters 95.17 (2009): 171906.
Version: Author's final manuscript
ISSN
0003-6951
1077-3118