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MM: Fachverband Metall- und Materialphysik
MM 20: Poster session
MM 20.6: Poster
Tuesday, March 27, 2007, 14:45–18:00, Poster C
Interaction of ceramic particles with an advancing dendritic solidification front — •Matthias Kolbe1, Thomas Lierfeld1,2, Thomas Schenk3, Gunther Eggeler2, and Dieter Herlach1 — 1DLR, Institut für Materialphysik im Weltraum, Linder Höhe, 51170 Köln — 2Ruhr-University Bochum, Institute of Materials IA1, 44780 Bochum — 3Lab. de Physique des Matériaux, ÉdM de Nancy, France
The interaction of ceramic particles with a dendritic solid/liquid interface has been investigated by undercooling experiments with different levels of convection: (i) in a terrestrial electromagnetic levitation facility (EML) and (ii) in TEMPUS, a facility for containerless processing, under low gravity conditions during parabolic flights. Entrapment of particles in ground experiments and engulfment of a significant fraction of submicron particles under low gravity conditions are attributed to the lower level of convection in the latter experiments and to morphological features of dendritic solidification. X-ray radiography at ESRF has been used for in-situ observations of directional solidification in Al90Cu10 with alumina particles.