Abstract
The dependence of primary arm spacings on growth speed has been investigated for cellular and dendritic arrays in directionally solidified Pb-10 wt pct Sn. The spatial arrangements of cells and dendrites, as given by their coordination number, are not very different from each other. The primary arm spacing maxima and the cell-to-dendrite transition appear to be strongly influenced by the magnitude of the solute partition coefficient(k). The planar-to-cellular transition in Pb-Sn(k = 0.50) is supercritical as compared to the subcritical behavior reported in Al-Cu (K = 0.14) and succinonitrile-acetone(k = 0.1).
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