Orientation dependence in superelastic Cu-Al-Mn-Ni micropillars
Author(s)Fornell Beringues, Jordina; Tuncer, Nihan; Schuh, Christopher A
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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  direction showed the largest total transformation strain (~7%), plastic deformation dominate d the compressive response in the pillars milled close to the  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.
DepartmentMassachusetts Institute of Technology. Department of Materials Science and Engineering
Journal of Alloys and Compounds
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.
Author's final manuscript