About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Microstructure-Sensitive Modeling Across Length Scales: An MPMD/SMD Symposium in Honor of David L. McDowell
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| Presentation Title |
Effects of Grain Neighborhood on Local Piezoelectric Response and Stress Concentration in Bulk Polycrystals |
| Author(s) |
Reilly Knox, Stanislav Udovenko, Betul Akkopru-Akgun, Amlan Das, Susan Trolier-McKinstry, Darren C. Pagan |
| On-Site Speaker (Planned) |
Darren C. Pagan |
| Abstract Scope |
The piezoelectric response of polycrystals is modulated by the local electrical and mechanical boundary conditions of individual grains. To maintain deformation compatibility, these boundary conditions impose mechanical elastic strains and, in turn, stresses that can be sufficient to limit piezoelectric performance and/or drive damage. Here, high-energy X-ray diffraction microscopy was performed at the Cornell High Energy Synchrotron Source on bulk lead-magnesium-niobate-lead-zirconate-titanate polycrystals under increasing DC bias. These measurements characterize the average 3D positions, orientations, and lattice strain tensors of ferroelectric domains. The data were combined with Quince, a finite element method-based tool for reconstructing sub-grain-scale stress fields, consistent with both measured strain tensors and principles of equilibrium and compatibility. Modeled stress fields are used to associate local stress concentrations with specific grain boundaries and grain neighborhoods. Findings will be used to guide microstructural design of new piezoelectric ceramics with improved functional and fatigue performance. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
ICME, Characterization, Ceramics |