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Proceedings Paper

Direct Microscopic And Microholographic Observations Of The Solidification Of Particles From Rapidly Stirred Melts
Author(s): R. J. Smeulders; F. H. Mischgofsky; H. J. Frankena
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Paper Abstract

A microscopic set-up to observe fast moving solidifying particles during stir casting is described. The set-up consists of a Ruby laser and a frequency doubled Nd3+:YAG laser, a model device of an actual stir casting apparatus filled with a transparent organic alloy, melting at a low temperature and three different recording systems. Using a neopentyl alcohol alloy as a model substance for metal alloys, the crystallization process is studied by direct observation. Pulses from both lasers are used to provide a sufficiently short exposure time to take (simultaneously) holograms, microphotographs and videorecordings of the fast moving (flow rates up to 10 ms-1) small particles with sizes in the order of 10-103 μm. Primarily solidified particles appear to have equiaxed dendritic shapes. The longest diameter of these particles attain a maximum for low stirring rates and high cooling rates. After a period of stirring, some of the dendrite tips grow and transform the particle shapes into more spherical ones. At this stage the morphology of the solidified particles shows a good similarity with stir casted metal alloys.

Paper Details

Date Published: 16 June 1983
PDF: 11 pages
Proc. SPIE 0369, Max Born Centenary Conf, (16 June 1983); doi: 10.1117/12.934412
Show Author Affiliations
R. J. Smeulders, Delft University of Technology (Netherlands)
F. H. Mischgofsky, Delft University of Technology (Netherlands)
Delft Soil Mechanics Laboratory (Netherlands)
H. J. Frankena, Delft University of Technology (Netherlands)


Published in SPIE Proceedings Vol. 0369:
Max Born Centenary Conf
M. John Colles; D. William Swift, Editor(s)

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