|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Materials Research in Reduced Gravity
||Microstructure Evolution in Undercooled Al-Fe Melts
||Jonas Valloton, Abdoul-Aziz Bogno, Dieter M Herlach, Hani Henein
|On-Site Speaker (Planned)
Containerless rapid solidification of Al-1.9wt%Fe and Al-8wt%Fe is investigated experimentally using the Impulse Atomization technique (IA), as well as ElectroMagnetic Levitation (EML) under terrestrial and reduced gravity conditions. While both compositions are hypereutectic, undercooling causes Al-1.9wt%Fe to solidify as a hypoeutectic composition in the metastable phase diagram. Both IA and EML samples exhibit cells of α-Al surrounded by a eutectic of α-Al and intermetallics. However, while the eutectic is regular in IA, EML samples show both regular and irregular eutectic structures depending on the undercooling. For Al-8wt%Fe the morphology difference differences of the primary intermetallics growing under terrestrial and microgravity conditions in EML are clear with acicular morphology for the former and a star-like morphology for the latter. The α-Al has a strong texture in the microgravity sample while a weak one is observed on ground. This difference is attributed to the weaker fluid flow occurring under reduced gravity conditions.
||Planned: A print-only volume