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Nonlocal Superelastic Model of Size-Dependent Hardening and Dissipation in Single Crystal Cu-Al-Ni Shape Memory Alloys

Author(s)
Qiao, Lei; Rimoli, Julian J.; Chen, Ying; Schuh, Christopher A.; Radovitzky, Raul
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Abstract
We propose a nonlocal continuum model to describe the size-dependent superelastic effect observed in recent experiments of single crystal Cu-Al-Ni shape memory alloys. The model introduces two length scales, one in the free energy and one in the dissipation, which account for the size-dependent hardening and dissipation in the loading and unloading response of micro- and nanopillars subject to compression tests. The information provided by the model suggests that the size dependence observed in the dissipation is likely to be associated with a nonuniform evolution of the distribution of the austenitic and martensitic phases during the loading cycle.
Date issued
2011-02
URI
http://hdl.handle.net/1721.1/64954
Department
Massachusetts Institute of Technology. Department of Aeronautics and Astronautics; Massachusetts Institute of Technology. Department of Materials Science and Engineering
Journal
Physical review letters
Publisher
American Physical Society
Citation
Qiao, Lei et al. “Nonlocal Superelastic Model of Size-Dependent Hardening and Dissipation in Single Crystal Cu-Al-Ni Shape Memory Alloys.” Physical Review Letters 106.8 (2011) : n. pag. © 2011 American Physical Society
Version: Final published version
ISSN
0031-9007

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