About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
|
Aluminum Alloys: Development and Manufacturing
|
| Presentation Title |
Solute clustering and early-stage precipitation in Al-Mg-Si alloys |
| Author(s) |
Chunan Li, Calin D. Marioara, Constantinos Hatzoglou, Sigmund J. Andersen, Randi Holmestad, Yanjun Li |
| On-Site Speaker (Planned) |
Chunan Li |
| Abstract Scope |
In Al-Mg-Si alloys, small sub-nanometer-sized solute clusters can form during natural aging (NA). This work investigates the atomic structures of solute clusters in Al-Mg-Si alloys using TEM and APT. It was found that in lean alloys, NA promotes 1–3 beta-double-prime-eyes GP-zones that act as precursors of beta-double-prime precipitates. In contrast, about 50% of NA clusters in dense alloys are binocular and square GP-zones, which are difficult to transform into beta-double-prime. As a result, NA has a strong negative effect for dense alloys, while for lean alloys a positive NA effect is observed. We further demonstrate that negative NA effect in dense alloys can be reversed by pre-aging treatment, which promotes multiple beta-double-prime-eyes GP-zones. During NA after pre-aging, more multiple beta-double-prime-eye type GP-zones can be formed instead of non-beta-double-prime type GP-zones. As a result, beta-double-prime are finer and denser after artificial aging, leading to a higher strength and ductility. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Aluminum, Phase Transformations, Characterization |