About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
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Computational Thermodynamics and Kinetics
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Presentation Title |
Investigations of Solute Clustering Kinetics during Quenching and Aging in Al-Zn-Mg-based Alloys |
Author(s) |
Zhucong Xi, Louis G. Hector Jr., Amit Misra, Liang Qi |
On-Site Speaker (Planned) |
Liang Qi |
Abstract Scope |
High-strength 7000 series Al (Al-Mg-Zn-based) alloys have severe formability limitations due to fast kinetics for the nucleation and growth of solute clusters and Guinier-Preston (GP) zones under quenching and subsequent natural aging at room temperature. These kinetic behaviors were investigated from both experimental and computational aspects. In situ heating followed by quenching at different rates and natural aging were carried out inside a transmission electron microscope. This revealed formation of solute clusters immediately after the quench and subsequent nucleation of GP-II zones adjacent to clusters during very early-stage (~10 mins) natural aging. Our kinetic Monte Carlo (kMC) simulations based on an accurate surrogate model of vacancy migration barriers confirmed the solute clusters form rapidly during quenching. We also investigate how dopant elements affect the solute clustering behavior by kMC simulations and the effects of these solute clusters on dislocation behavior by molecular dynamics simulations. |
Proceedings Inclusion? |
Planned: |