Diffusion-coefficient measurements in liquid metallic alloys

J. H. Lee, Shan Liu, Hirofumi Miyahara, R. Trivedi

    研究成果: Contribution to journalArticle査読

    49 被引用数 (Scopus)

    抄録

    The value of the diffusion coefficient in the liquid (Dl) is generally obtained from the measurement of composition profiles ahead of a quenched planar interface. The experimental results show significant scatter. The main reason for this scatter will be shown to be due to the presence of fluid flow in the liquid. Directional-solidification studies in the Al-Cu system have been carried out to first establish the experimental conditions required for diffusive growth. The composition profiles are then measured to obtain the values of Dl for alloy compositions ranging from 4.0 to 24.0 wt pet Cu. The value of Dl = 2.4 × 10-3 mm2/s was obtained along the liquidus line, and this result is significantly smaller than the values reported in the literature, which vary from 3.0 to 5.5 × 10-3 mm2/s. It is shown that the scatter in the reported values can be correlated with the diameter of the sample used and, thus, with the fluid flow present in their experiments. Detailed experimental procedures to obtain and verify diffusive-growth conditions are outlined, and appropriate analyses of the data are discussed.

    本文言語英語
    ページ(範囲)909-917
    ページ数9
    ジャーナルMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
    35
    5
    DOI
    出版ステータス出版済み - 1 1 2004

    All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 材料力学
    • 金属および合金
    • 材料化学

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