About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Frontiers in Solidification X
|
| Presentation Title |
Unified 3D DEM-Based modeling of crystal migration and deformation in semi-solid aluminum alloys |
| Author(s) |
Te-Cheng Su, Ke-Chen Huang, Wei-Jie Chen, Ling-En Yao, Hao-Chuan Huang, Ying-Shuo Tseng, Yen-Fang Song, Gung-Chian Yin |
| On-Site Speaker (Planned) |
Te-Cheng Su |
| Abstract Scope |
This study presents a unified 3D numerical framework for simulating the grain-scale behavior of semi-solid aluminum alloys across the dendrite coherency threshold. At low solid fractions, a coupled CFD-DEM approach models the shear-induced migration and centerline segregation of externally solidified crystals (ESCs) during mold filling, revealing the influence of local shear gradients on particulate crystal transport. At higher solid fractions, DEM simulations capture granular deformation using grain assemblies reconstructed from synchrotron X-ray tomography, with particle size and shape distributions extracted through digital 3D image processing. Contact laws between DEM particles are calibrated to reproduce stress-strain responses from triaxial compression tests. The model captures key mechanisms, including dilation, strain localization, and non-affine rearrangement under load. This two-regime simulation strategy offers new insight into the transition from liquid-suspended particle motion to solid-network deformation, supporting the design of high-performance pressurized casting methods such as high-pressure die casting, squeeze casting, and thixoforming. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Modeling and Simulation, Solidification |