| 过冷金属熔体中枝晶生长的各向异性效应 |
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| 引用本文： | 单洪彬,王建国,惠希东.过冷金属熔体中枝晶生长的各向异性效应[J].北京科技大学学报,2007,29(4):382-385,446. |
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| 作者姓名： | 单洪彬 王建国 惠希东 |
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| 作者单位： | 北京科技大学新金属材料国家重点实验室,北京,100083 |
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| 摘 要： | 基于Karma-Rappel相场模型,模拟了纯金属在量纲为1过冷度为0.45时等轴枝晶生长过程中晶粒形貌和温度场的变化. 研究了不同各向异性条件下等轴晶晶粒形貌的演化过程. 模拟结果显示,各项异性系数的大小对晶粒的形貌有重要影响. 当各项异性为0.05时,枝晶在生长过程中出现了"颈缩"现象,枝晶中温度梯度最大的方向总是与最优生长方向保持一致.
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| 关 键 词： | 金属熔体 枝晶生长 各向异性 相场方法 数值模拟 过冷度 金属熔体 枝晶生长 各向异性效应 molten metal dendritic growth effect 生长方向 最优 温度梯度 现象 颈缩 影响 晶粒形貌 大小 系数 各项异性 显示 模拟结果 演化过程 |
| 修稿时间： | 2006-01-072006-03-28 |
Anisotropic effect of equiaxed dendritic growth in a undercooled molten metal |
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| SHAN Hongbin,WANG Jianguo,HUI Xidong.Anisotropic effect of equiaxed dendritic growth in a undercooled molten metal[J].Journal of University of Science and Technology Beijing,2007,29(4):382-385,446. |
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| Authors: | SHAN Hongbin WANG Jianguo HUI Xidong |
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| Institution: | The State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China |
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| Abstract: | Based on the Karrna-Rappel phase field model, the equiaxed dendritic growth and change in temperature field in a pure molten metal were numerically simulated at an initial dimensionless supercooling of 0.45. Morphological evolvement of dendrites at various anisotropic coefficients was investigated. The result shows that anisotropic coefficient significantly affects the dendrite morphology. During dendritic growth, obvious necking phenomenon appears as the anisotropic coefficienf is 0.05. The preferred growth direction of dendrites is always kept consistent with that of the highest temperature gradient. |
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| Keywords: | molten metal dendritic growth anisotropy phase field numerical simulation |
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