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In Situ Observation of Cell-to-Dendrite Transition |
| PAN Xiu-Hong;HONG Yong;JIN Wei-Qing |
| Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050 |
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| Cite this article: |
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PAN Xiu-Hong, HONG Yong, JIN Wei-Qing 2005 Chin. Phys. Lett. 22 2966-2968 |
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Abstract The cell-to-dendrite transition of succinonitrile melt suspended on a loop-shaped Pt heater is observed in real time by a differential interference microscope coupled with Schlieren technique. The transition is divided into two parts: a dendrite coalition process and a subsequent dendrite elimination process. Firstly the dendrites from the same cell are united into a single dendrite. Secondly the competitive growth of dendrites from different cells leads to the elimination of dendrites. The two processes can be understood when involving crystallographic orientation. In addition, the tip velocity and primary spacing of a cell/dendrite are also measured. It turns out that the primary spacing has a significant jump, whereas the growth velocity has no abrupt change during the cell-to-dendrite transition.
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| Keywords:
81.05.Bx
68.08.De
81.30.Fb
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Published: 01 November 2005
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| PACS: |
81.05.Bx
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(Metals, semimetals, and alloys)
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68.08.De
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(Liquid-solid interface structure: measurements and simulations)
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81.30.Fb
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(Solidification)
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