Orientation dependence in superelastic Cu-Al-Mn-Ni micropillars
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...
Main Authors: | , , |
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Other Authors: | , |
Format: | Article |
Language: | English |
Published: |
Elsevier,
2019-03-07T13:53:49Z.
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Subjects: | |
Online Access: | Get fulltext |
Summary: | 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. United States. Army Research Office. Institute for Soldier Nanotechnologies (contract number W911NF-13-D-0001) Marie Curie Individual Fellowships ((FP7-PEOPLE-2012-IOF call) under contract number 327017) |
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