About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Algorithms Development in Materials Science and Engineering
|
Presentation Title |
Relaxing the Local Equilibrium Assumption in Quantitative Phase-Field Models |
Author(s) |
Alexander F. Chadwick |
On-Site Speaker (Planned) |
Alexander F. Chadwick |
Abstract Scope |
Phase-field models (PFMs) are invaluable tools when modeling the evolution of complex materials interfaces. However, the local chemical equilibrium assumption of popular quantitative formulations such as the Kim-Kim-Suzuki and Grand Potential Methods requires that all species are soluble in all phases and can create significant numerical complexity. Here, we present a PFM that modifies the adopted diffusion equations to directly embed the desired interface conditions. This introduces the total interface fluxes into the energy dissipation, which relaxes the local chemical equilibrium assumption and enables the consideration of exact reaction stoichiometries. As a result, chemical potentials do not need to be defined for insoluble or absent species. This new PFM has a simplified implementation compared to the previous formulations, but maintains the well-posed equilibrium required for quantitative interpretability. As a demonstration of the framework’s utility, examples for solid-state phase transformations, rapid solidification, and electrochemistry are presented. |
Proceedings Inclusion? |
Planned: |
Keywords |
Computational Materials Science & Engineering, Modeling and Simulation, Phase Transformations |