About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
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Frontiers in Solidification: An MPMD Symposium Honoring Jonathan A. Dantzig
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| Presentation Title |
Microstructural Evaluation of Containerless Solidification of Al-Ce Alloys |
| Author(s) |
Jonas Valloton, Akankshya Sahoo, Marcelino da Silva Dias Filho, Sven C Vogel, Hani Henein |
| On-Site Speaker (Planned) |
Jonas Valloton |
| Abstract Scope |
Cerium containing aluminum alloys consist mainly of fcc α-Al and Al11Ce3 intermetallic and are of interest for high temperature alloys. Due to the near zero solubility of cerium in α-Al (<50 ppm at the eutectic temperature), Al11Ce3 is very stable against high temperature dissolution. Furthermore, cerium currently remains a relatively inexpensive rare-earth alloying element. Here, containerless solidification of hypoeutectic Al-5wt%Ce and hypereutectic Al-20wt%Ce is carried out using ElectroMagnetic Levitation and Impulse Atomization. The effects of rapid solidification on the microstructures are analyzed using neutron diffraction, X-ray and electron microscopy and Electron Backscattered Diffraction. In Al-5Ce, a deviation from <100> growth direction is observed in the primary α-Al. Whereas the eutectic is mostly lamellar in Al-5Ce, the morphology of eutectic Al11Ce3 changes to so-called Chinese script in Al-20Ce. Finally, in the smallest atomized Al-20Ce droplets, nucleation of primary Al11Ce3 is bypassed in favor of an α-Al-Al11Ce3 coupled zone. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Aluminum, Characterization, |