About this Abstract |
Meeting |
2024 TMS Annual Meeting & Exhibition
|
Symposium
|
Computational Thermodynamics and Kinetics
|
Presentation Title |
Phase Field Modeling of Abnormal Grain Growth Induced by Cyclic Heat Treatment |
Author(s) |
Zachary Croft, Marcel Chlupsa, Guanglong Huang, Eli Rotman, Ashwin Shahani, Katsuyo Thornton |
On-Site Speaker (Planned) |
Zachary Croft |
Abstract Scope |
Cyclic heat treatment of polycrystalline alloys has shown potential as a cost-effective method of large single-crystal production. The conversion of polycrystals to a single crystal occurs through abnormal grain growth. It has been hypothesized that strain-energy stored in dislocation networks formed during the heat treatment provides a driving force for abnormal grain growth. To address this hypothesis, we employ phase field modeling of grain growth with consideration of strain-energy contributions in the system’s free energy. The model was developed based on synchrotron high-energy X-ray diffraction microscopy observations. We account for the dislocation formation during the cyclic heat treatment by periodic reinjection of dislocations. Large scale 2D simulations show evidence of abnormal grain growth, wherein a small grain grows at the expense of a large grain due to the difference in their dislocation densities. Additionally, simulated grain growth dynamics in 3D based on the experimentally derived initial condition will be presented. |
Proceedings Inclusion? |
Planned: |
Keywords |
Modeling and Simulation, Computational Materials Science & Engineering, ICME |