Halo formation in directional solidification

Nave, M. D., Dahle, A. K. and St John, D. H. (2002) Halo formation in directional solidification. Acta Materialia, 50 11: 2837-2849. doi:10.1016/S1359-6454(02)00104-0


Author Nave, M. D.
Dahle, A. K.
St John, D. H.
Title Halo formation in directional solidification
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2002-06-28
Sub-type Article (original research)
DOI 10.1016/S1359-6454(02)00104-0
Volume 50
Issue 11
Start page 2837
End page 2849
Total pages 13
Place of publication Oxford
Publisher Elsevier Ltd.
Language eng
Subject C1
291403 Alloy Materials
671004 Castings
Abstract A new model of halo formation in directional solidification is presented. The model describes halo formation in terms of competitive growth between the halo phase and coupled eutectic in liquid with a nominal composition that follows the primary phase liquidus extension with decreasing temperature. The model distinguishes between the effects of constitutional, capillarity and (where applicable) kinetic undercooling and avoids a number of theoretical inconsistencies associated with previous models. The critical growth rate for halo formation in directionally solidified hypereutectic Al-Si alloys is calculated using the model in conjunction with models of primary phase and coupled eutectic growth from the literature. The calculated result agrees reasonably well with the experimental result of Yilmaz and Elliott (Met. Sci. 18 (1984) 362), given the use of a relatively simple isolated dendrite tip model to calculate the growth undercooling of the halo tip. (C) 2002 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Casting
Aluminium
Theory
Modeling
Growth
Eutectic Alloy Systems
Dendritic Growth
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
School of Mechanical & Mining Engineering Publications
 
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Created: Mon, 13 Aug 2007, 23:04:14 EST