| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Hume-Rothery Symposium on Thermodynamics of Microstructure Stability and Evolution
|
| Presentation Title |
A mesoscale integrated model of microstructure evolution and property degradation in nuclear fuels |
| Author(s) |
Shenyang Hu, Zirui Mao, benjamion Beeler |
| On-Site Speaker (Planned) |
Shenyang Hu |
| Abstract Scope |
The defect concentration in radiated materials is several orders of magnitude higher than the thermal equilibrium concentration, which not only affects the species’ diffusivity, but also the phase stability. Additionally, anisotropic stresses associated with geometric constraints impact migration barriers of defects, hence, stress-induced preferential attraction (SIPA) and creep. In this talk, a mesoscale model integrating microstructure-dependent rate theory, a finite difference-informed Random Walk (FDiRW) solver for solving fast diffusion of species on grain boundaries, crystal plasticity, and a phase field model of gas bubble evolution will be presented. Monolithic U-Mo fuels for converting highly enriched 235U fuels to low-enriched 235U fuels is taken as the model system to describe the integrated model. The effect of grain structures, fission rate, SIPA, and defect properties on volumetric swelling and creep rates will be presented to demonstrate the predictive capability of fuel properties for a macroscale fuel performance model. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Phase Transformations, Modeling and Simulation |