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  • Modeling of grain refinement Part III for an Al-7Si-0.3Mg alloy

    Author(s)
    Yao, X
    McDonald, SD
    Dahle, AK
    Davidson, CJ
    StJohn, DH
    Griffith University Author(s)
    Yao, Xiangdong
    Year published
    2008
    Metadata
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    Abstract
    Following Part I [X. Yao, et al., J. Mater. Res. 23(5), 1282 (2008)] and Part 11 [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, ...
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    Following Part I [X. Yao, et al., J. Mater. Res. 23(5), 1282 (2008)] and Part 11 [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.
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    Journal Title
    Journal of Materials Research
    Volume
    23
    Issue
    5
    DOI
    https://doi.org/10.1557/JMR.2008.0155
    Subject
    Condensed matter physics
    Solid state chemistry
    Physical properties of materials
    Materials engineering
    Mechanical engineering
    Publication URI
    http://hdl.handle.net/10072/38393
    Collection
    • Journal articles

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