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Elevated Temperature, In Situ Micromechanical Characterization of a High Temperature Ternary Shape Memory Alloy

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Raghavan,  Rejin
Empa, Swiss Federal Laboratories for Materials Science and Technology, Laboratory for Mechanics of Materials and Nanostructures, Feuerwerkerstrasse 39, Thun, Switzerland;
Synthesis of Nanostructured Materials, Structure and Nano-/ Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Wheeler, J. M., Niederberger, C., Raghavan, R., Thompson, G. B., Weaver, M. L., & Michler, J. (2015). Elevated Temperature, In Situ Micromechanical Characterization of a High Temperature Ternary Shape Memory Alloy. JOM-Journal of the Minerals Metals & Materials Society, 67(12), 2908-2913. doi:10.1007/s11837-015-1627-x.


Cite as: http://hdl.handle.net/21.11116/0000-0001-BAAB-D
Abstract
The microthermomechanical behavior of a precipitation-hardenable Ni-48Ti-25Pd (at.) shape memory alloy has been investigated as a function of temperature. Micropillars were fabricated within a large 〈145〉-oriented grain and compressed in situ in the SEM at elevated temperatures corresponding to the martensite and austenite phase transformation temperatures. The precipitation-strengthened alloys exhibited stable pseudoelastic behavior with little or no residual strains when near the transformation temperatures. In the plastic regime, slip was observed to occur via pencil glide, circumventing the fine scale precipitates along multiple slip planes. © 2015, The Minerals, Metals Materials Society.