About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
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Symposium
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Deformation Mechanisms, Microstructure Evolution, and Mechanical Properties of Nanoscale Materials
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Presentation Title |
Size Effects on the Stress-induced Martensitic Transformation in Cu-based Shape Memory Alloys |
Author(s) |
Jose F Gómez-Cortés, María L. Nó, Mikel Pérez-Cerrato, Isabel Ruiz-Larrea, Tomasz Breczewski, Jose M. San Juan |
On-Site Speaker (Planned) |
Jose M. San Juan |
Abstract Scope |
Shape memory alloys (SMAs) are functional materials exhibiting specific shape memory and superelastic effects, which found number of potential applications in micro and nano technologies. In particular, Cu-based SMAs offer a very good behavior at small scale in comparison with the traditional TiNi alloys. However, the functional properties of SMAs at small scale exhibit several size effects on the stress-induced martensitic transformation.
In the present work we present an overview of the size effects observed on the stress-induced transformation in ternary Cu-Al-Ni and Cu-Al-Be SMA as well as in its quaternary alloys. The size effect on the critical stress was quantified through nano compression tests on micro/nano pillars between 2 and 0.25 micrometer in diameter. The comparison of the behavior in ternary and quaternary Cu-base SMAs, allows establishing a universal scaling law for the observed size effects, which is explained through and atomic model for martensite nucleation in confined volumes. |
Proceedings Inclusion? |
Planned: |
Keywords |
Mechanical Properties, Nanotechnology, Phase Transformations |