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 th...
| Main Authors: | , , |
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| Other Authors: | |
| Format: | Article |
| Language: | en_US |
| Published: |
Elsevier
2019
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| Online Access: | http://hdl.handle.net/1721.1/120775 https://orcid.org/0000-0001-7660-7210 https://orcid.org/0000-0001-9856-2682 |
| 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. |
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