ON THE PARTICLE PUSHING DURING SOLIDIFICATION

Acta Metall Sin

1996, Vol. 32

Issue (4): 363-367 DOI:

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ON THE PARTICLE PUSHING DURING SOLIDIFICATION

HAN Qingyou; J. D. HUNT(University of Oxford; England) (Manuscript received 1995-09-20)

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HAN Qingyou; J. D. HUNT(University of Oxford; England) (Manuscript received 1995-09-20). ON THE PARTICLE PUSHING DURING SOLIDIFICATION. Acta Metall Sin, 1996, 32(4): 363-367.

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Abstract Particle pushing is one of the basic problems involved during solid-liquid phase transformation. Classical theory suggested that particle pushing is governed by the surface energy interactions, but this theory could not used to explain particle pushing occurring during the production of some metal-matrix composites. the authors propose that particle pushing is a result of fluid flow that occurs at the front of the solid-liquid interface. Two mechanisms for particle pushing as a result of fluid flow are presented and the criteria for particle pushing are derived. Experiments, carried out to verify the mechanisms and the criteria,show good agreement with theoretical model.Correspondent HAN Qingyou,(Department of Materials, University of Oxford, Parks Road, Oxford OX1 3PH, England)

Key words: particle pushing solidification fluid flow

Received: 18 April 1996

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