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Modeling of grain refinement: Part I. Effect of the solute titanium for aluminum

Published online by Cambridge University Press:  31 January 2011

X. Yao ,
S.D. McDonald ,
A.K. Dahle ,
C.J. Davidson  and
D.H. StJohn
X. Yao*
Affiliation:
School of Engineering, University of Queensland, Brisbane, 4072 QLD, Australia
S.D. McDonald
Affiliation:
CRC Centre for Metals Manufacturing (CAST) Cooperative Research Centre, University of Queensland, Brisbane, 4072 QLD, Australia
A.K. Dahle
Affiliation:
CRC Centre for Metals Manufacturing (CAST) Cooperative Research Centre, University of Queensland, Brisbane, 4072 QLD, Australia
C.J. Davidson
Affiliation:
Commonwealth Scientific and Industrial Research Organization (CSIRO)—Manufacturing & Infrastructure Technology, Kenmore, 4069 QLD, Australia
D.H. StJohn
Affiliation:
CRC Centre for Metals Manufacturing (CAST) Cooperative Research Centre, University of Queensland, Brisbane, 4072 QLD, Australia
*
a)Address all correspondence to this author. e-mail: x.yao@uq.edu.au
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Abstract

Over the past few decades, the grain refinement of Al alloys has been extensively investigated theoretically and experimentally. However, the relative importance of the parameters that contribute to grain refinement still remains unclear and is likely to be dependent on specific solidification conditions. This paper aims to investigate the mechanisms by which Ti, a common grain-refining addition in commercial-purity aluminum (CP), contributes to grain refinement using a cellular automaton—finite control volume method (CAFVM). CAFVM is used to model the grain formation and microstructure morphology under different conditions, e.g., with and without refiners, for Al alloys. In this Part I, the effect of adding solute of Ti on grain formation through its effect on growth restriction, constitutional undercooling, and the formation of extra-potential particles are taken into account in the calculations. It is shown that the calculated results are in reasonable agreement with the experimental data.

Keywords

AlGrain sizeNucleation & growth
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1282 - 1291
Copyright
Copyright © Materials Research Society 2008

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References

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