About this Abstract |
Meeting |
2025 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys: Development and Manufacturing
|
Presentation Title |
In situ STEM study of the atomic structures of Al-intermetallics interface during melting and solidification of recycled Al alloys |
Author(s) |
Yueyuan Wang, Kang Xiang, Jiawei Mi |
On-Site Speaker (Planned) |
Yueyuan Wang |
Abstract Scope |
Studying in real-time and at atomic scale, the nucleation and growth dynamics of intermetallics of alloys in different thermomechanical conditions is extremely difficult. However, such work is important on how to control the microstructures from atomic level above. Recently, we used FIB to mill Al-5Cu-1.5Fe-1.0Si alloy foil samples containing typical Al-Cu and Al-Fe intermetallics. We then used Wildfire nano-chip heater to melt in situ these samples inside a JEOL ARM300CF STEM at 200 kV.
We then studied the atomic structure changes across Al-intermetallics interface during melting&solidification. The structure changes were found to occur across the interface of ~10 atomic layers. It changed from a pure amorphous state to an intermediate state and then a pure crystalline state. Different solute atoms significantly influenced the characteristics of the interface and structures. These new findings are valuable in developing new strategies to control phase nucleation by optimizing different combination of solute elements. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Characterization, Phase Transformations |