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The effect of an electric field on the morphological stability of the crystal-melt interface of a binary alloy

The effect of an electric field on the morphological stability of the crystal-melt interface of a binary alloy
The effect of an electric field on the morphological stability of the crystal-melt interface of a binary alloy
We perform a 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. We take account of the electromigration of solute and the differing electrical conductivities of solid and liquid for a model in which the temperature gradient is constant. We compare our results with the constitutional supercooling criterion and show there may be substantial differences. We derive a modified constitutional supercooling criterion which is valid over a large range of conditions. We also find under certain conditions that the onset of instability may be time dependent.
0022-0248
1-15
Wheeler, A.A.
eb831100-6e51-4674-878a-a2936ad04d73
Coriell, S.R.
8499c8d5-e69d-43c6-9224-a3b550f98a38
McFadden, G.B.
56b0d29e-1cfb-4775-96d1-d32d50ea08d2
Hurle, D.T.J.
3050de2f-c0e1-44e1-95e5-8c3cd7f50f08
Wheeler, A.A.
eb831100-6e51-4674-878a-a2936ad04d73
Coriell, S.R.
8499c8d5-e69d-43c6-9224-a3b550f98a38
McFadden, G.B.
56b0d29e-1cfb-4775-96d1-d32d50ea08d2
Hurle, D.T.J.
3050de2f-c0e1-44e1-95e5-8c3cd7f50f08

Wheeler, A.A., Coriell, S.R., McFadden, G.B. and Hurle, D.T.J. (1988) The effect of an electric field on the morphological stability of the crystal-melt interface of a binary alloy. Journal of Crystal Growth, 88 (1), 1-15. (doi:10.1016/S0022-0248(98)90002-1).

Record type: Article

Abstract

We perform a 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. We take account of the electromigration of solute and the differing electrical conductivities of solid and liquid for a model in which the temperature gradient is constant. We compare our results with the constitutional supercooling criterion and show there may be substantial differences. We derive a modified constitutional supercooling criterion which is valid over a large range of conditions. We also find under certain conditions that the onset of instability may be time dependent.

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Published date: 1988

Identifiers

Local EPrints ID: 830
URI: https://eprints.soton.ac.uk/id/eprint/830
ISSN: 0022-0248
PURE UUID: 53661828-d699-464b-85d3-7200e81de4c0

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Date deposited: 31 Mar 2004
Last modified: 17 Jul 2017 17:17

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