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Article: Cellular/dendritic array tip morphology during directional solidification of Pb-5.8 wt pct sb alloy
- Article from:
- Metallurgical and Materials Transactions
- Article date:
- September 1, 1999
- Author:
CopyrightCopyright Minerals, Metals & Materials Society Sep 1999. Provided by ProQuest LLC. (Hide copyright information)
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Cellular/dendritic array tip morphology has been examined in directionally solidified and quenched Pb-5.8 wt pct Sb alloy by a serial sectioning and three-dimensional image reconstruction technique. There is a large scatter in the tip radius, the nearest neighbor spacing, and the mushy zone length, even among the immediately neighboring cells and dendrites. This scatter may be caused by the natural convection (in the mushy zone and in the bulk melt at the array tip), which also produces macrosegregation along the length of the directionally solidified samples. Even in the presence of convection, however, the tip radii are observed to be approximately proportional to the square of the ...