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Effect of solute on the growth rate and the constitutional undercooling ahead of the advancing interface during solidification of an alloy and the implications for nucleation

Published online by Cambridge University Press:  03 March 2011

X. Yao ,
A.K. Dahle ,
C.J. Davidson  and
D.H. StJohn
X. Yao*
Affiliation:
Cooperative Research Centre (CRC) for Cast Metals and Manufacturing (CAST), Department of Mining, Minerals & Materials Engineering, University of Queensland, Brisbane, 4073 QLD, Australia
A.K. Dahle
Affiliation:
Cooperative Research Centre (CRC) for Cast Metals and Manufacturing (CAST), Department of Mining, Minerals & Materials Engineering, University of Queensland, Brisbane, 4073 QLD, Australia
C.J. Davidson
Affiliation:
Commonwealth Scientific and Industrial Research Organization (CSIRO)—Manufacturing & Infrastructure Technology, Kenmore, 4069 QLD, Australia
D.H. StJohn
Affiliation:
Cooperative Research Centre (CRC) for Cast Metals and Manufacturing (CAST), Department of Mining, Minerals & Materials Engineering, University of Queensland, Brisbane, 4073 QLD, Australia
*
a) Address all correspondence to this author. e-mail: x.yao@minmet.uq.edu.au
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Abstract

A framework is presented for modeling the nucleation in the constitutionally supercooled liquid ahead of the advancing solid/liquid interface. The effects of temperature gradient, imposed velocity, slope of liquidus, and initial concentration have been taken into account in this model by considering the effect of interface retardation, which is caused by solute buildup at the interface. Furthermore, the effect of solute concentration on the chemical driving force for nucleation has been considered in this model. The model is used for describing the nucleation of Al–Si and Al–Cu alloys. It was found that the solute of Si has a significant impact on the chemical driving force for nucleation in Al–Si alloys whereas Cu has almost no effect in Al–Cu alloys.

Keywords

DiffusionNucleation & growth
Type
Articles
Information
Journal of Materials Research , Volume 21 , Issue 10 , October 2006 , pp. 2470 - 2479
Copyright
Copyright © Materials Research Society 2006

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References

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