Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Succinonitrile-1.9 wt pct acetone has been directionally solidified in 0.7 X 0.7-cm-square cross section pyrex ampoules in order to observe the cell/dendrite tip morphologies, not influenced by the ''wall effects,'' which are present during growth in the generally used thin (about 200 mu m) crucibles. The tips do not maintain a steady-state shape, as is generally assumed. Instead, they fluctuate within a shape envelope. The extent of fluctuation increases with decreasing growth speed, as the micro structure changes from the dendritic to cellular. The influence of natural convection has been examined by comparing these morphologies with those grown, without convection, in the thin ampoules.
Song, Hui and Tewari, Surendra N., "Time Dependence of Tip Morphology During Cellular Dendritic Arrayed Growth" (1996). Chemical & Biomedical Engineering Faculty Publications. 13.
Song, H., & Tewari, S.N. (1996). Time Dependence of Tip Morphology During Cellular Dendritic Arrayed Growth. Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 27, 1111-1119.
Copyright 1996 ASM International. This paper was published in Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, Vol. 27, Issue 4, pp. 1111-1119 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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