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Nucleation During the Solidification of Atomized Droplets Catalyzed by Spherically-Shaped Oxide Particles

Published online by Cambridge University Press:  26 February 2011

Matthew R. Libera ,
Gregory B. Olson  and
John B. Vander Sande
Matthew R. Libera
Affiliation:
Department of Materials Science and Engineering Massachusetts Institute of Technology, Cambridge, MA 02139
Gregory B. Olson
Affiliation:
Department of Materials Science and Engineering Massachusetts Institute of Technology, Cambridge, MA 02139
John B. Vander Sande
Affiliation:
Department of Materials Science and Engineering Massachusetts Institute of Technology, Cambridge, MA 02139
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Abstract

Nucleation temperatures are calculated for the case of solidification in atomized metal droplets where spherical substrate particles act as nucleation catalysts. Following the method of Fletcher, the effect of substrate size on catalytic potency is illustrated, and the model is applied to the nucleation of bcc solid from pure, liquid iron containing oxide substrate particles as catalysts. Supercooling data from the literature are used to determine wetting angles for alumina, silica, and rare-earth oxide. Oxide particle-size distributions are then used to predict the supercooling behavior of atomized liquid droplets based on the probability that a given size of droplet will contain a particular size of substrate particle. A transition size regime is found separating droplet sizes undergoing very small and very large supercoolings, respectively. This is discussed in terms of the types and number densities of inclusions present during atomization of the melt.

Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 80: Symposium G – Science and Technology of Rapidly Quenched Alloys , 1986 , 245
Copyright
Copyright © Materials Research Society 1987

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