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Directional Solidification of Alloys in Systems Containing a Liquid Miscibility Gap

Published online by Cambridge University Press:  15 February 2011

R. N. Grugel ,
T. A. Lograsso  and
A. Hellawell
R. N. Grugel
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, Michigan, USA
T. A. Lograsso
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, Michigan, USA
A. Hellawell
Affiliation:
Department of Metallurgical Engineering, Michigan Technological University, Houghton, Michigan, USA
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Abstract

The problem considered is the unidirectional growth of alloys close to monotectic composition and within the miscibility gap when the direction of gravity is down the temperature gradient (solidification upwards) or up the temperature gradient (solidification downwards). The systems Al-In and Al-Bi are taken as examples. With solidification upwards it is shown that bulk liquid composition adjusts to that of the monotectic while in the reverse situation, the bulk liquid gradually rises. In the former case it is possible to grow aligned fibrous structures of monotectic composition but in the latter the microstructures are irregular and globular.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 553
Copyright
Copyright © Materials Research Society 1982

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References

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