About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Computational Thermodynamics and Kinetics
|
| Presentation Title |
Quantifying Atomistic-Continuum Models for Studying Plasticity Effects During Rapid Solidification |
| Author(s) |
Sammohith Nittala, Jaarli Suviranta, Tatu Pinomaa, Thomas Voisin, Duncan Burns, Joseph T. McKeown, Anssi Laukkanen, Nikolas Provatas |
| On-Site Speaker (Planned) |
Sammohith Nittala |
| Abstract Scope |
Additive manufactured samples of metals such as Aluminum and Tantalum have shown a significantly increased density of dislocations in the solidified sample, resulting in intra-grain orientation gradients as well as the formation of subgrains. The evidence suggests that these defects occur during the solidification process itself, but the mechanisms remain largely unclear. We present new findings from Phase Field Crystal (PFC) modelling (which are continuum models operating with atomic length scale resolution and diffusive timescale resolution) that show a clear connection between the solidification morphology and the resulting subgrain and orientation-gradient structure in the solidified sample. We also map such PFC models onto known solidification (sharp-interface) theories and propose new kinetics to obtain quantitative agreement with experiment. This is a crucial step towards building a quantitative model for solidification that can capture the entire spectrum of the angstrom-micron scale physics on the solidification timescales in a computationally efficient manner. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Solidification, Computational Materials Science & Engineering, Additive Manufacturing |