About this Abstract |
| Meeting |
2026 TMS Annual Meeting & Exhibition
|
| Symposium
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Advanced Real Time Imaging for Materials Science and Processing
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| Presentation Title |
In situ STEM imaging atomic structure transition of the phases in a recycled Al alloy during melting and solidification |
| Author(s) |
Yueyuan Wang, Kang Xiang, YiFan Wang, Mohsen Danaie, Chris Allen, Matthew Spink, Jiawei Mi |
| On-Site Speaker (Planned) |
Yueyuan Wang |
| Abstract Scope |
Research on atomic structure transitions during liquid-to-solid and solid-to-solid transformations is central to condensed matter physics and materials science. However, real-time observation in metal alloys at high temperatures remains challenging.
We investigated the nucleation and growth of intermetallic phases in a recycled Al5Cu1.5Fe1.0Si alloy using a JEOL ARM300CF STEM with a wildfire nano-chip heater (up to 1000 °C) at ePISC, Diamond Light Source. Real-time imaging revealed atomic transitions at Al₃Fe/Al₂Cu and Al/Al₃Fe interfaces during melting and cooling.
A clear amorphous-to-crystalline transition occurred within ~10 atomic layers, with solute atoms diffusing to preferred sites to form intermediate phases. From 20–585 °C, atomic reorientation of Al₃Fe (10°–15°) and Cu-rich zone formation via vacancy diffusion jointly lowered the nucleation barrier and promoted Al₂Cu nucleation at the Al₃Fe/Al interface.
These findings highlight the potential of solute element tuning to control nucleation dynamics and optimize Fe-containing intermetallics in recycled Al alloys. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Phase Transformations, Characterization |