A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles

Easton, M. A. and St John, D. H. (2001) A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles. Acta Materialia, 49 10: 1867-1878. doi:10.1016/S1359-6454(00)00368-2


Author Easton, M. A.
St John, D. H.
Title A model of grain refinement incorporating alloy constitution and potency of heterogeneous nucleant particles
Journal name Acta Materialia   Check publisher's open access policy
ISSN 1359-6454
Publication date 2001
Sub-type Article (original research)
DOI 10.1016/S1359-6454(00)00368-2
Volume 49
Issue 10
Start page 1867
End page 1878
Total pages 12
Place of publication Oxford
Publisher Pergamon-elsevier Science Ltd
Language eng
Subject 291403 Alloy Materials
091207 Metals and Alloy Materials
Abstract A model for the determination of relative grain size is developed based on the assumption that nucleant substrates are activated by constitutional undercooling generated by growth of an adjacent grain. The initial rate of development of constitutional undercooling is shown to be equivalent to the growth restriction factor and is a useful approximation for the effect of solute on grain size when potent nucleant substrates are present. However, when the nucleants are of a poor potency then a calculation of the fraction solid necessary to develop the constitutional undercooling required for nucleation needs to be performed. Using the model, trends in grain size observed experimentally by the addition of titanium to pure aluminium and to a typical casting alloy, AlSi7Mg0.3, can be predicted. II was also found that summing the individual growth restriction factors of each solute element in a multi-component alloy can grossly overestimate the actual value of the growth restriction factor for the alloy. (C) 2001 Acta Materialia Inc. Published by Elsevier Science Ltd. All rights reserved.
Keyword Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
grain refinement
aluminium alloys
nucleation
Al-ti-b
Aluminum-alloys
Solidification
Mechanism
Growth
Additions
Titanium
Size
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 17 Oct 2007, 10:32:50 EST