About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advanced Characterization Techniques for Quantifying and Modeling Deformation
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| Presentation Title |
Variant Selection in Polycrystalline CuAlNi and NiTi Shape Memory Alloys Investigated with In-Situ X-Ray Topotomography |
| Author(s) |
Janice Moya, Wolfgang Ludwig, Timothy Thompson, Jonathan Wright, James Ball, Adam Creuziger, Ashley Bucsek |
| On-Site Speaker (Planned) |
Janice Moya |
| Abstract Scope |
Understanding habit plane variant (HPV) selection is essential for predicting and engineering the properties of materials that undergo martensitic phase transformations. In this study, we employ in-situ X-ray topotomography to resolve three-dimensional (3D) microstructures during stress-induced martensitic phase transformations with sub-micrometer spatial resolutions. X-ray topotomography, an X-ray diffraction imaging technique, captures 360-degree views of individual grains by aligning the tomographic rotation axis with the crystal's scattering vector. This technique enables 3D imaging of the austenite parent phase and, by way of diffraction contrast, the evolving martensitic domains. The in-situ experiments were performed at beamline ID11 of the European Synchrotron Radiation Facility. We characterize key transformation features, including martensite nucleation at triple junctions, grain boundary interactions, and the formation of multiple intersecting martensite variants. Finally, we use in-situ topotomography measurements of polycrystalline copper-aluminum-nickel (CuAlNi) and nickel-titanium (NiTi) shape memory alloys to propose new HPV selection criteria for polycrystalline materials. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Phase Transformations, Other |