Effect of gravity convection on interface morphology during solidification |
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Authors: | Duan MengMeng Chen ChangLe Li ZhanYao Jin QuanWei |
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Institution: | Shaanxi Key Laboratory of Condensed Matter Structures and Properties, Northwestern Polytechnical University, Xi'an 710072, China |
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Abstract: | An experimental apparatus consisting of a crystal growth room and a crystal growth observation system was developed for the
study of the effect of the gravity convection perpendicular to the growth direction on the growth process by use of model
alloy succinonitrile (SCN)-5wt%ethanol. It was found that the convection improves the stability of the interface and causes
the downstream alternation of the cell growth direction because of the dual effect of the Stokes force and the gravity. The
second dendrite arm facing the flow comes into being earlier than that at another side when the interface transforms cell
to dendrite. Then the dendrite at the side facing the flow comes into being earlier. The second dendrite arm facing the flow
grows faster and is more developed than that at another side. In addition, the primary dendrite arm spacing increases and
the dendrite tip radius decreases under the gravity convection.
Supported by the National Natural Science Foundation of China (Grant Nos. 50331040 and 60171043) |
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Keywords: | gravity convection solidification interface morphology model alloy |
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