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Gravitationally Induced Convection During Directional Solidification of off-Eutectic Mn-Bi Alloys

Published online by Cambridge University Press:  15 February 2011

Ron G. Pirich
Ron G. Pirich*
Affiliation:
Metals Science Laboratory, Research Department, Grumman Aerospace Corporation, Bethpage, New York, USA
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Abstract

The effects of thermal and solute gradient, gravity induced convection during vertical directional solidification, on longitudinal macrosegregation of Bi and Mn rich off-eutectic starting compositions, has been studied as a function of composition, growth velocity and gravity vector orientation. Since the morphology of these alloys is characterized by an aligned, rodlike permanent magnet composite when grown cooperatively, the magnetic properties were used to measure composition segregation and the transition from dendritic to composite growth. Severe macrosegregation was observed in all cases studied and the degree of convection inferred by modeling the observed composition segregation using a stagnant film approach. Morphological stability was found to follow a constitutional supercooling-type law for both Bi and Mn rich compositions.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 9 , 1981 , 593
Copyright
Copyright © Materials Research Society 1982

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References

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