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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

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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.

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Authors and Affiliations

  1. Cooperative Research Centre (CRC) for Cast Metals and Manufacturing (CAST), Department of Mining, Minerals & Materials Engineering, University of Queensland, Brisbane, 4073, QLD, Australia

    X. Yao & A. K. Dahle

  2. Commonwealth Scientific and Industrial Research Organization (CSIRO)—Manufacturing & Infrastructure Technology, Kenmore, 4069, QLD, Australia

    C. J. Davidson

  3. Cooperative Research Centre (CRC) for Cast Metals and Manufacturing (CAST), Department of Mining, Minerals & Materials Engineering, University of Queensland, Brisbane, 4073, QLD, Australia

    D. H. StJohn

Authors
  1. X. Yao
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  2. A. K. Dahle
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  3. C. J. Davidson
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  4. D. H. StJohn
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Correspondence to X. Yao.

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Yao, X., Dahle, A.K., Davidson, C.J. et al. 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. Journal of Materials Research 21, 2470–2479 (2006). https://doi.org/10.1557/jmr.2006.0302

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  • DOI: https://doi.org/10.1557/jmr.2006.0302

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