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Solutal convection induced macrosegregation and the dendrite to composite transition in off-eutectic alloysThe effect of solute gradient induced convection during vertical solidification on the macrosegregation of Pb-rich Pb-Sn off-eutectic alloys is determined experimentally as a function of composition and growth rate. In many cases macrosegregation is sufficient to prevent the plane front solidification of the alloy. The transition from dendritic to composite structure is found to occur when the composition of the solid is close enough to the eutectic composition to satisfy a stability criterion based on the ratio of the liquid temperature gradient to growth rate. A vertical or horizontal magnetic field of 0.1 T (1 kilogauss) does not reduce macrosegregation, but downward solidification (liquid below solid) virtually eliminates macrosegregation in small (3 mm) diameter samples.
Document ID
19810039707
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Boettinger, W. J.
(National Bureau of Standards Washington, DC, United States)
Biancaniello, F. S.
(National Bureau of Standards Washington, DC, United States)
Coriell, S. R.
(National Bureau of Standards, Center for Materials Science, Washington D.C., United States)
Date Acquired
August 11, 2013
Publication Date
February 1, 1981
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 12A
Subject Category
Metallic Materials
Accession Number
81A24111
Distribution Limits
Public
Copyright
Other

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