| Model for calculation of microstructural development in rapidly directionally solidified immiscible alloys |
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| 引用本文： | 赵九洲. Model for calculation of microstructural development in rapidly directionally solidified immiscible alloys[J]. 中国有色金属学会会刊, 2002, 12(3): 366-369 |
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| 作者姓名： | 赵九洲 |
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| 作者单位： | InstituteofMetalResearch,TheChineseAcademyofSciences,Shenyang110016,China |
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| 基金项目： | 中国科学院"百人计划" |
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| 摘 要： | A model has been developed for the calculation of the microstructural evolution in a rapidly directionally solidified immiscible alloy.Numerical solutions have been performed for Al-Pb immiscible alloys.The results demonstrate that at a higher solidfication velocity a constituteional supercooling region appears in front of the solid/liquid interface and the liquid-liquid decomposition takes place in this region.A higher solidification velocity leads to a higher nucleation rate and ,therefore,a higher number density of the minority phase droplets.A s a result,the average radius of droplets in the melt at the solid/liquid interface decreases with the solidification velcity.
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| 关 键 词： | 难熔合金 显微结构 定向凝固 计算模型 连续铸造 |
Model for calculation of microstructural development in rapidly directionally solidified immiscible alloys |
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| Abstract: | A model has been developed for the calculation of the microstructural evolution in a rapidly directionally solidified immiscible alloy. Numerical solutions have been performed for Al-Pb immiscible alloys. The results demonstrate that at a higher solidification velocity a constitutional supercooling region appears in front of the solid/liquid interface and the liquid-liquid decomposition takes place in this region. A higher solidification velocity leads to a higher nucleation rate and, therefore, a higher number density of the minority phase droplets. As a result, the average radius of droplets in the melt at the solid/liquid interface decreases with the solidification velocity. |
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| Keywords: | immiscible alloy directional solidification microstructure theory and modeling |
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