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Microsegregation in directionally solidified Pb-8.4 at. pct Au alloy

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Abstract

The dependence of microsegregation behavior on growth rate and thermal gradient has been examined in a Pb-8.4 at. pct Au alloy material partially directionally solidified and quenched. The composition of the quenched “liquid” at the dendrite tip (C t), that of the eutectic-like solid phase freezing from the interdendritic liquid at the base of dendrite(C se), the volume fraction of this eutectic-like region(f e), and solute profiles in the interdendritic quenched liquid and ahead of the dendrite have been measured. Two dendritic growth models for solidification of a binary alloy melt in a positive thermal gradient at the liquid-solid interface, one for dendrites with “minimum undercooled dendrite tip” and the other for an Ivantsov type of dendrite with “marginally stable tip,” have been examined for a quantitative comparison with measured values ofC 1, Cse, andf e. Convection in the melt, possibly due to horizontal density gradients, is found to be a serious limitation for theoretical understanding of the observed experimental behavior and meaningful comparison of theories.

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Authors and Affiliations

  1. Department of Chemical Engineering, Cleveland State University, 44115, Cleveland, OH

    S. N. Tewari (Associate Professor)

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  1. S. N. Tewari
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Tewari, S.N. Microsegregation in directionally solidified Pb-8.4 at. pct Au alloy. Metall Trans A 19, 1351–1364 (1988). https://doi.org/10.1007/BF02662596

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