Document Type

Article

Publication Date

4-1996

Publication Title

Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

Abstract

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.

Original Citation

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.

Volume

33

Issue

12

DOI

10.1007/BF02649779

Version

Publisher's PDF

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