Evaluation of the superelastic behavior at nano-scale on long-term cycling in Cu-Al-Ni micropillars array

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Abstract

A 4x4 array of square cross-section micro-pillars was milled by focused ion beam technique on an [001] Cu-Al-Ni shape memory alloy single crystal. All pillars in the array were tested in nano-compression using an instrumented nanoindenter. The micro-pillars superelastic response was tested over hundreds cycles on all pillars and over thousands on two randomly selected pillars. Superelastic behavior was evaluated from its load-depth curves individually using the loss factor as evaluation parameter in the 200 th cycle. Recoverable and reproducible superelastic behavior has been observed during the long-term cycling tests and the mean loss factor was 0.16. These results open the door for the design of devices that could be integrated in MEMS technology with a good reliability.

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Gómez-Cortés, J. F., Nó, M. L., Jiao, C., López, G. A., & Juan, J. S. (2015). Evaluation of the superelastic behavior at nano-scale on long-term cycling in Cu-Al-Ni micropillars array. Materials Today: Proceedings, 2, S887–S890. https://doi.org/10.1016/j.matpr.2015.07.424

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