|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Applications of Solidification Fundamentals
||Scandium Effect on Undercooling and Dendrite Morphology of Al–4.5 wt.%Cu Droplets
||Jonas Valloton, Abdoul-Aziz Bogno, Daniel Auras, Marie Bedel, Guillaume Reinhart, Hani Henein
|On-Site Speaker (Planned)
Increasing the mechanical properties of the final product is an ongoing challenge in the field of Additive Manufacturing. These properties can be improved through microstructural refinement via rapid solidification as well as through alloying elements addition. In this work, rapid solidification of Al-4.5wt%Cu alloys with minor Sc addition (up to 0.4wt%) is investigated experimentally using two different containerless solidification techniques: Impulse Atomization (IA) and ElectroMagnetic Levitation (EML). Temperature measurements in EML show that addition of Sc decreases both the primary and eutectic undercoolings. This is corroborated by estimated undercoolings for IA droplets based on measured fractions of eutectic and modeling of secondary dendrite arms coarsening. Microtomography analysis of IA droplets reveals a transition from <100> to <111> dendrites as the undercooling increases. While no refinement is observed, the additions of Sc tends to favor the growth of <100> dendrites under similar solidification conditions.
||Planned: Supplemental Proceedings volume