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Modeling of grain refinement: Part III. Al–7Si–0.3Mg aluminum alloy

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 (CSIR)—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: [email protected]
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Abstract

Following Part I [X. Yao, et al., J. Mater. Res.23(5), 1282 (2008)] and Part II [X. Yao, et al., J. Mater. Res.23(5), 1292 (2008)] the cellular automation–finite control volume method (CAFVM) model was used to study the grain formation and microstructure morphology resulting from solidification of a commercial Al–Si–Mg alloy with Al–Ti–B grain refiner additions. The model incorporates the effect of the introduced solute Ti and the alloying elements of Si and Mg on the growth restriction factor, constitutional undercooling, and nucleation parameters. With respect to grain refinement, it is found that the alloying elements, Si and Mg, play a role that is similar to Ti qualitatively while different quantitatively. Accordingly, a concept of “equivalent solute” determined by phase diagram parameters such as the solute partitioning coefficient and the liquidus slope is proposed to clarify the effect of each solute in the alloy on grain formation during solidification. Based on the calculations and on comparison to the experimental data, a possible mechanism of grain refinement in this alloy system is proposed.

Keywords

AlloyGrain sizeNucleation & growth
Type
Articles
Information
Journal of Materials Research , Volume 23 , Issue 5 , May 2008 , pp. 1301 - 1306
Copyright
Copyright © Materials Research Society 2008

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References

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