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Dresden 2006 – scientific programme

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MM: Metall- und Materialphysik

MM 25: Poster Session

MM 25.17: Poster

Wednesday, March 29, 2006, 15:30–17:30, P4

Dendritic solidification of metallic melts with ceramic particles — •Matthias Kolbe1, Thomas Lierfeld1,2, Phanikumar Gandham1,3, Thomas Schenk4,5, Gunther Eggeler2, and Dieter M. Herlach11Institute for Space Simulation, DLR, Cologne, Germany — 2Institute of Materials, Ruhr-University Bochum, Germany — 3Department of Metallurgical and Materials Engineering, IITM, Chennai, India — 4Experiments Division (ID19), ESRF, Grenoble, France — 5Laboratoire de Physique des Matériaux, ÉdM de Nancy, France

The interaction of a dendritic solid/liquid interface with ceramic particles (Ni98Ta2 + Ta2O5) has been investigated by undercooling experiments at 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. Directional solidification of Al90Cu10 with alumina particles has been observed in-situ by X-ray radiography at ESRF. Tip splitting of Al-rich dendrites and evolution of cauliflower morphology has been observed. No evidence has been found for an influence of the alumina particles on dendrite growth.

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