Experimental investigation of the interaction of a dendritic solidification front with foreign particles

Autor: Matthias Kolbe, D. M. Herlach, T. Lierfeld, G. Eggeler
Rok vydání: 2006
Předmět:
Zdroj: Microgravity - Science and Technology. 18:170-173
ISSN: 1875-0494
0938-0108
DOI: 10.1007/bf02870403
Popis: Metal matrix composites (MMC) have many technical applications, e. g. in automotive industry, and have still a great potential. Usually they are produced by expensive powder metallurgy. Cost effective solidification of the material directly from a particle containing melt requires an understanding of the interaction of the ceramic particles with the advancing solidification front. The knowledge is limited about dendritic solidification with particles. The experimental idea in this work is to deeply undercool the melt below its melting point, resulting in a fast propagating dendritic solid/liquid interface. Due to the rapid solidification, microstructure is frozen and the spatial distribution of particles in the microstructure can be analyzed postmortem. Experimental techniques are processing in a terrestrial electromagnetic levitation facility (EML) and, under low gravity conditions during parabolic flight, in the TEMPUS facility. Convection has a strong influence on the interaction between particles and dendritic solidification front. The experiments under low gravity show the importance of the reduction of melt convection on particle distribution within the rapidly solidified sample.
Databáze: OpenAIRE
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