Quantitative simulation of Fe-rich intermetallics in Al-Si-Cu-Fe alloys during solidification

Junsheng Wang, Peter D. Lee

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

    Abstract

    Fe-rich intermetallic phases (e.g. β-Al5FeSi) which form during the solidification of Al-Si-Cu-Fe alloys can have a detrimental effect on the mechanical properties of cast components. A thermodynamic database was combined with a numerical solution of the multicomponent diffusion solver to predict the formation of this phase. The growth kinetics and morphology was simulated using a combined Monte-Carlo algorithm to calculate the transformation frequency for each cell as a function of total free energy, with the faceted shapes replicated via a decentred needle/plate algorithm. The non-stoichiometric composition of both Fe and Si was simulated by changing the partition coefficient at the S/L interface according to local kinetic parameters such as growth velocity and effective diffusion. The model predicted phase fraction, size and morphology of Fe-rich intermetallic phases in type-319 alloys (Al-7.5wt.%Si-3.5wt.%Cu-0.2 ∼ 0.8wt.%Fe) compared well to high resolution synchrotron tomography results.
    Original languageEnglish
    Title of host publicationTMS Annual Meeting|TMS Annu Meet
    Pages123-130
    Number of pages7
    Volume1
    Publication statusPublished - 2009
    EventTMS 2009 - 138th Annual Meeting and Exhibition - San Francisco, CA
    Duration: 1 Jul 2009 → …

    Conference

    ConferenceTMS 2009 - 138th Annual Meeting and Exhibition
    CitySan Francisco, CA
    Period1/07/09 → …

    Keywords

    • Aluminium alloys
    • Fe-rich intermetallics
    • Kinetics
    • Simulation
    • Solidification

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