About this Abstract |
| Meeting |
2027 TMS Annual Meeting & Exhibition
|
| Symposium
|
Chemistry and Physics of Interfaces
|
| Presentation Title |
Atomistic Insights into Solid-Melt Interfacial Properties and Dendrite Orientation Transition in Al-Mg-Zn Alloys |
| Author(s) |
Amrutdyuti Swamy, Pabitra Choudhury |
| On-Site Speaker (Planned) |
Pabitra Choudhury |
| Abstract Scope |
Solid-melt interfacial properties dictate dendrite growth morphology and the resulting texture of cast materials. While binary alloys are well-studied, predicting microstructures in commercial multicomponent aluminum alloys requires understanding complex, competing solute interactions. To bridge this gap, we employ Molecular Dynamics (MD) to investigate equilibrium solidification in ternary Al-Mg-Zn alloys. We find that progressively replacing Mg with Zn shifts the preferred dendrite growth from the conventional <100> directions to a hyperbranched morphology, which is marked macroscopically by feathery grains. This transition is driven by a combined atomic size mismatch and chemical affinity mismatch between the solvent and solute atoms. Additionally, while the interfacial energy remains relatively stable, it increases slightly in Zn-rich compositions due to Chemical Short-Range Ordering (CSRO) adjacent to the interface. Ultimately, this study reveals how solute-solute interactions can modulate interfacial properties, offering a practical pathway to achieve alternate dendrite growth directions by tuning the alloy chemistry. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Computational Materials Science & Engineering, Thin Films and Interfaces |