Cellular/dendritic array tip morphology during directional solidification of Pb-5.8 wt pct Sb alloy

Cellular/dendritic array tip morphology has been examined in directionally solidified and quenched Pb-5.8 wt pet Sb alloy by a serial sectioning and t hree-dimensional image reconstruction technique. There is a large scatter i n the tip radius, the nearest neighbor spacing, and the mushy zone length, even among the immediately neighboring cells and dendrites. This scatter ma y be caused by the natural convection (in the mushy zone and in the bulk me lt at the array tip), which also produces macrosegregation along the length of the directionally solidified samples. Even in the presence of convectio n, however, the tip radii are observed to be approximately proportional to the square of the primary spacings, and the radii are in a good quantitativ e agreement with the predictions from the model due to Hunt-Lu.