About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
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Symposium
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Fatigue in Materials: Fundamentals, Multiscale Characterizations and Computational Modeling
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Presentation Title |
In-situ Characterization of Functional Fatigue in CuAlNi Shape Memory Alloys Using X-ray
Topotomography, Diffraction Contrast Tomography, and 3D X-ray Diffraction
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Author(s) |
Janice Moya, Wolfgang Ludwig, Yuefeng Jin, Timothy Thompson, Jonathan Wright, Adam Creuziger, Ashley Bucsek |
On-Site Speaker (Planned) |
Janice Moya |
Abstract Scope |
A diversity of ferroelastic, ferroelectric, and ferromagnetic materials exhibit unique functional behaviors that are enabled by a reversible martensitic phase transformation. However, functional fatigue—changes to functional behavior upon cycling as a result of defect generation—continues to be a major barrier to martensitic phase transforming solid-state technologies. In this work, synchrotron X-ray characterization is used to understand the microstructural origins of functional fatigue in copper-aluminum-nickel (CuAlNi) shape memory alloys. We employ a multi-modal approach combining X-ray topotomography, diffraction contrast tomography, and 3D X-ray diffraction during in-situ mechanical cycling. These techniques are used to spatially resolve the 3D morphology of stress-induced martensite microstructures, the resultant dislocation structures after unloading, and how these dislocations influence martensite formation during subsequent cycles. The results demonstrate how martensite interacts with and generates defects and whether the complex behavior of functional fatigue and the martensite transformation repeatability between mechanical loading cycles are related. |
Proceedings Inclusion? |
Planned: |
Keywords |
Characterization, Phase Transformations, Copper / Nickel / Cobalt |