EFFECT OF LIQUID FLOW ON PRIMARY ARM SPACING OF CONSTRAINED COLUMNAR CRYSTALS

Abstract

Abstract: An experimental apparatus,which has a convection generator and an aid-heater,is developed for the study of the effect of stable laminar liquid flow on the directional solidification process by the use of transparent alloy SCN-2wt-% Ace.The flow is perpendicular to primary arms. By in-situ observation and photographing at different specific moments,it has been found that such a flow can cause a great change in primary spacings of constrained columnar crystals:for cells,the spacings become smaller;but for dendrites,they become larger.The former is mainly due to the tilted growth of upstreamside branches,while the latter is mainly due to the coup- ling effect of liquid flow with solutal field around dendrite tips.The faster the liquid flows,the further smaller the cell spacing and the further larger the dendrite spacing.

Key words: forced liquid flow, directional solidification, dendrite spacing, cell spacing

LIU Shan LU Deyang HUANG Tao ZHOU Yaohe National Lab of Solidification Processing,Northwestern Polytechnical University,Xi'an,China LIU Shan,lecturer,National Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China. EFFECT OF LIQUID FLOW ON PRIMARY ARM SPACING OF CONSTRAINED COLUMNAR CRYSTALS[J]. Acta Metallurgica Sinica (English Letters), 1993, 6(5): 320-325.

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EFFECT OF LIQUID FLOW ON PRIMARY ARM SPACING OF CONSTRAINED COLUMNAR CRYSTALS

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