About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
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| Symposium
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Fundamental Science of Microstructural Evolution and Phase Transformations: An MPMD/FMD/SMD Symposium in Honor of Peter Voorhees
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| Presentation Title |
Effect of Ag on the precipitation stability in Al-Mg-Si-Ag alloy: First-principles calculations, Calphad modeling and experimental validation |
| Author(s) |
Wei Shao, Witold Chrominski, Mark Fedorov, Chenying Shi, Jan S. Wróbel, Javier Llorca |
| On-Site Speaker (Planned) |
Javier Llorca |
| Abstract Scope |
Al-Mg-Si-Ag alloys offer a desirable balance between formability and strain-hardening potential. However, complete crystal structure information of precipitate phases is not always available or unambiguous. Thus, the Gibbs free energy of different phases in the Al-Mg-Si-Ag alloy system was determined by combining first-principles calculations, cluster expansion and Monte Carlo simulations. This information was used to develop a thermodynamic database of the Al-Mg-Si-Ag system, enabling accurate determination of phase stability and distribution. The results revealed that Ag significantly modifies solute clustering behavior and promotes the formation of Guinier-Preston zones at the early stages of the precipitation. In contrast, the crystal structure of the β″ strengthening phase was not influenced by Ag. The developed TDB for this quaternary alloy will facilitate the prediction of thermodynamic properties in binary and ternary systems involving Al, Mg, Si and Ag. It also provides a robust foundation for extrapolating more complex Al-Mg-Si-based alloy systems. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Phase Transformations, |