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The effect of an electric field on the morphological stability of the crystal-melt interface of a binary alloyA fully time-dependent linear stability analysis of the morphological stability of a planar interface during directional solidification of a binary alloy at constant velocity in the presence of an electric field, is performed. The electromigration of solute and the differing electrical conductivities of solid and liquid for a model in which the temperature gradient is constant are taken into account. The present results are compared with the constitutional supercooling criterion, and it is shown there may be substantial differences. A modified constitutional supercooling criterion which is valid over a large range of conditions is derived. It is also found under certain conditions that the onset of instability may be time dependent.
Document ID
19880046503
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Wheeler, A. A.
(Bristol, University United Kingdom)
Coriell, S. R.
(Bristol Univ. United Kingdom)
Mcfadden, G. B.
(NBS Gaithersburg, MD, United States)
Hurle, D. T. J.
(Royal Signals and Radar Establishment Malvern, United Kingdom)
Date Acquired
August 13, 2013
Publication Date
April 1, 1988
Publication Information
Publication: Journal of Crystal Growth
Volume: 88
Issue: 1, Ap
ISSN: 0022-0248
Subject Category
Materials Processing
Accession Number
88A33730
Distribution Limits
Public
Copyright
Other

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