About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Aluminum Alloys, Processing and Characterization
|
Presentation Title |
In Situ Processing of Rapidly Solidified Al-33wt%Cu Droplets |
Author(s) |
Jonas Valloton, Najia Mahdi, Loraine Rabago, Hani Henein |
On-Site Speaker (Planned) |
Jonas Valloton |
Abstract Scope |
Under rapid solidification conditions, Al-33wt%Cu eutectic droplets develop a microstructure composed of two different morphologies: an undulated eutectic, assumed to grow during recalescence, followed by a lamellar eutectic growing post recalescence. In situ heat treatments are applied to Al-33wt%Cu droplets rapidly solidified using Impulse Atomization to investigate the dynamic effect of temperature and time on the two eutectic morphologies. The samples are aged in situ in a SEM using a heating stage developed by Norcada. The undulated region coarsens faster than the regular eutectic, with fine lamellae still visible at 500°C. At 525°C, both regions are indistinguishable from each other. Coarsening rates are evaluated for both regions and compared to established models. At 550°C the droplet is fully liquid, but retains its shape due to the oxide skin. This allows in situ solidification experiments. The resulting eutectic morphologies and spacings are analyzed as a function of the imposed cooling rates. |
Proceedings Inclusion? |
Planned: Light Metals |
Keywords |
Aluminum, Other, Solidification |