Abstract
Directional solidification experiments have been extended to Pb-Pd and Pb-Au alloys. The primary spacing, λ, has been determined over a wide range of temperature gradients,G, and solidification velocities,V. The dependence of the spacing on bothG andV is found to undergo a transition as the values ofV andG are lowered. The transition withG is not correlated with the dendritic to cellular transformation. However, the transition withV appears to correlate with duplex microstructures which are observed in the dendritic to cellular transition region.
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