Simulation of the columnar-to-equiaxed transition in alloy solidification -- the effect of nucleation undercooling, density of nuclei in bulk liquid and alloy solidification range on the transition

H. J. Dai, H. B. Dong, H. V. Atkinson, P. D. Lee

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    A coupled cellular automaton-finite difference (CA-FD) model is used to simulate the detailed dendritic structure evolution of the columnar-to-equiaxed transition (CET) for Al-Cu alloys during solidification. The effects of material properties (nucleation undercooling, density of nuclei in bulk liquid and alloy solidification range) on the CET are investigated. Simulated results reveal that: (1) equiaxed grains form at an earlier stage with a smaller critical nucleation undercooling; (2) CET is promoted if the density of nuclei in bulk liquid is increased; (3) extending the alloy solidification range promotes the CET. Finally, CET maps corresponding to different alloy concentrations are constructed, illustrating the relationship between processing conditions and the resulting grain structures for alloys with different solidification ranges.

    Original languageEnglish
    Title of host publicationTheory, Modeling and Numerical Simulation of Multi-Physics Materials Behavior
    PublisherTrans Tech Publications Ltd
    Pages129-134
    Number of pages6
    Volume139
    ISBN (Print)9783908451563
    DOIs
    Publication statusPublished - 2008
    EventSymposium on Theory, Modeling and Numerical Simulation of Multiphysics Behavior, 2007 - Boston, United States
    Duration: 26 Nov 200730 Nov 2007

    Publication series

    NameSolid State Phenomena
    Volume139
    ISSN (Electronic)16629779

    Conference

    ConferenceSymposium on Theory, Modeling and Numerical Simulation of Multiphysics Behavior, 2007
    Country/TerritoryUnited States
    CityBoston
    Period26/11/0730/11/07

    Keywords

    • Columnar-to-equiaxed transition
    • Computer simulation
    • Directional solidification
    • Solidification structure

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