Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
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 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 primary spacings, and the radii are in a good quantitative agreement with the predictions from the model due to Hunt-Lu.
Yu, L.; Ding, G. L.; Reye, J.; Ojha, S. N.; and Tewari, Surendra N., "Cellular/Dendritic Array Tip Morphology During Directional Solidification of Pb-5.8 Wt Pct Sb Alloy" (1999). Chemical & Biomedical Engineering Faculty Publications. 8.
Yu, L., Ding, G.L., Reye, J., Ojha, S.N., & Tewari, S.N. (1999). Cellular/Dendritic Array Tip Morphology During Directional Solidification of Pb-5.8 Wt Pct Sb Alloy. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 30, 2463-2472.
Copyright 1999 ASM International. This paper was published in Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 30, Issue 9, pp. 2463-2472 and is made available as an electronic reprint with the permission of ASM International. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplications of any material in this paper for a fee or for commercial purposes, or modification of the content of this paper are prohibited.
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