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| INFLUENCE OF CHANGING HEAT FLOW DIRECTION ON CRYSTAL GROWTH DIRECTION DURING DIRECTIONAL SOLIDIFICATION——Observation on Crystallization of Transparent Metalloidal Organic Compound |
| HUANG Weidong; MAO Zhiying; ZHOU Yaohe (North-western Polytechnical University; Xi~' an) |
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Cite this article:
HUANG Weidong; MAO Zhiying; ZHOU Yaohe (North-western Polytechnical University; Xi~' an). INFLUENCE OF CHANGING HEAT FLOW DIRECTION ON CRYSTAL GROWTH DIRECTION DURING DIRECTIONAL SOLIDIFICATION——Observation on Crystallization of Transparent Metalloidal Organic Compound. Acta Metall Sin, 1986, 22(5): 140-156.
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Abstract Camphene-1.2% cyclohexanol which freezes like metals, has been used for the investigation of crystal growth during directional solidification with continuously changing heat flow direction. The interface morphology of the columnar crystal changed according to the heat flow and this led to a change in the growth direetion of the columnar crystals. For cellular growth, the cells lay between <001> and the heat flow direction, and approached more closely to the <001> as the ratio of temperature gradient to growth rate decreased. For dendritic growth, the trunks grew in the <001> direction and did not change whatever the direction of heat flow. In contrast the sidebranches were very much affected by the heat flow direction——the sidebranches on the side against heat flow direction developed faster. The direction of columnar crystals tended to follow the heat flow direction, but different mechanism operated depending on the interface morphology.
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Received: 18 May 1986
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| 1 黄卫东,西北工业大学铸造专业硕士论文,1984．屯屯屯屯屯屯{ |
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