Orientation dependence in superelastic Cu-Al-Mn-Ni micropillars
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Orientation.pdf
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794.8 KB
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Author(s)
Fornell Beringues, Jordina
Tuncer, Nihan
Schuh, Christopher A
Date Issued
February 2017
Journal
Journal of Alloys and Compounds
Publisher
Elsevier
Citation
Fornell, J., N. Tuncer, and C.A. Schuh. “Orientation Dependence in Superelastic Cu-Al-Mn-Ni Micropillars.” Journal of Alloys and Compounds 693 (February 2017): 1205–1213.
Version
Author's final manuscript
Abstract
The superelastic behavior of single crystal Cu-Al-Mn-Ni shape memory alloy micro-pillars was studied under compression as a function of crystallographic orientation. Cylindrical pillars of about 2 μm diameter were micro-machined from targeted crystal orientations. While pillars oriented close to the [001] direction showed the largest total transformation strain (~7%), plastic deformation dominate d the compressive response in the pillars milled close to the [111] direction due to their high elastic anisotropy combined with the large stresses required to induce th e transformation. Shape strain contour plots were constructed for γ’ and β’ martensites, and the martensite start stress was calculated using the Clausius-Clapeyron equation. The same general trends are observed in both the experimental and calculated results, with some exceptions: larger transformation stresses and lower transformation strains are observed in the microsized pillars.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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Creative Commons Attribution-NonCommercial-NoDerivs License
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DOI of Published Version
https://doi.org/10.1016/j.jallcom.2016.10.090
