About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
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| Symposium
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Field-Assisted Material Processing and Solidification
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| Presentation Title |
Electrothermal-Microstructure Modeling of Air-Atmosphere Flash Sintering and Grain Growth in 8YSZ
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| Author(s) |
Sky A. Soltero, Rebeca Contreras , Colin Delaney, Theodore Norris, Wenwu Xu |
| On-Site Speaker (Planned) |
Sky A. Soltero |
| Abstract Scope |
Flash sintering of 8 mol% yttria-stabilized zirconia (8YSZ) yields rapid densification and grain growth through strongly coupled electrical, thermal, and microstructural evolution. This work combines quasi-in situ air-atmosphere flash sintering experiments with molecular dynamics simulations and theoretical calculations to examine flash sintering processing mechanisms. Experimental current-voltage traces, density evolution, and grain size measurements capture three processing stages: incubation, flash onset, and current-limited annealing. A geometry-aware one-dimensional electrothermal-microstructure model computes local current density, Joule heating, temperature, densification, and Zener-limited grain growth in the dog-bone specimen. The thermal baseline captures flash onset and center hot-spot formation, while field-enhanced diffusivity and state-dependent grain boundary mobility are essential to reproduce the observed final density and grain size. The model additionally connects electrode polarization and contact heating to anode-cathode asymmetry. Together, experiment and simulation illuminate how air-atmosphere flash sintering couples heat, defects, and microstructure, offering a framework for future mechanism-guided process design. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Ceramics, Powder Materials, Additive Manufacturing |