Modeling of microsegregation and precipitation of iron metallic compounds in Al-Fe-Si ternary alloy

Makoto Morishita, Hitoshi Ishida, Makoto Yoshida

    Research output: Contribution to journalArticle

    3 Citations (Scopus)

    Abstract

    In order to develop high quality aluminum alloy products, modeling to predict a behavior of solute distribution in dendrite and precipitation within the inter-cell region quantitatively is important. However Scheil's and Brody-Flemings's equations can't find the precipitation behavior during solidification because a diffusion in liquid phase is not considered. Numerical analysis methods typified by "Phase Field" are more effective but a calculation time has not been enough short to apply industrial use, yet. Consequentially a mathematical model is developed based on the Matsumiya's calculus of finite differences for analyzing inter-cell microsegregation and precipition. Diffusion of solutes in both the solid and liquid is taken into consideration, and realistic mesh shape to calculate microsegregation is conducted for finite difference calculation at this Matsumiya's model. But the calculus hardly predict precipitation behavior, since liquid concentration shift by precipitation during solidification is not considered. Then we improved the model to estimate precipitation of intermetallic compounds by thermodynamics database in this work. Additionally evaluation method of microsegregation used by EPMA was developed Consequently, we built a new segregation model, which could predict both the microsegregation and the kinds and amount of intermetallic compounds.

    Original languageEnglish
    Pages (from-to)157-163
    Number of pages7
    JournalKeikinzoku/Journal of Japan Institute of Light Metals
    Volume60
    Issue number4
    DOIs
    Publication statusPublished - 2010 Apr

    Fingerprint

    Iron Compounds
    Metallic compounds
    Ternary alloys
    Iron
    Intermetallics
    Solidification
    Diffusion in liquids
    Liquids
    Electron probe microanalysis
    Numerical analysis
    Aluminum alloys
    Thermodynamics
    Mathematical models

    Keywords

    • Precipitation
    • Prediction model
    • Segregation
    • Solidification

    ASJC Scopus subject areas

    • Materials Chemistry
    • Metals and Alloys
    • Mechanical Engineering
    • Mechanics of Materials

    Cite this

    Modeling of microsegregation and precipitation of iron metallic compounds in Al-Fe-Si ternary alloy. / Morishita, Makoto; Ishida, Hitoshi; Yoshida, Makoto.

    In: Keikinzoku/Journal of Japan Institute of Light Metals, Vol. 60, No. 4, 04.2010, p. 157-163.

    Research output: Contribution to journalArticle

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