| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Phase Field Study of Acicular Growth at Grain Boundaries: Effects of Interface Coherency |
| Author(s) |
Ahmed Dimokrati, Benoît Appolaire, Maeva Cottura |
| On-Site Speaker (Planned) |
Ahmed Dimokrati |
| Abstract Scope |
Acicular micostructures are found in various metallic systems undergoing phase transformations at high temperatures. These structures consist of distinctive colonies of parallel lamellae, with the same structure and orientation. Their precipitation occurs predominately at the grain boundaries and then grow into the grains of the parent phase. During such transformation, the coherency state of the interfaces is seemingly to play a predominant role in controlling the process.
Here, we conduct a phase field study of the isothermal, diffusion-controlled, acicular growth of precipitates with anisotropic transformation eigenstrains. Interface incoherency is achieved by plastically relaxing elastic stresses in a confined region near the interface, allowing grain boundary sliding. The model is then applied to examine precipitates growth at a grain boundary, extending into the adjacent grains, with different interface coherency states. The morphology, kinetics, and the triple junction behavior are closely investigated providing new insights into the acicular structures growth. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Phase Transformations, Computational Materials Science & Engineering, Modeling and Simulation |