| 过冷纯金属熔体中热扩散系数对其枝晶生长的影响 |
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| 引用本文： | 田卫星 孙建俊 郑洪亮 詹成伟 田学雷. 过冷纯金属熔体中热扩散系数对其枝晶生长的影响[J]. 山东工业大学学报, 2006, 36(5): 5-8 |
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| 作者姓名： | 田卫星 孙建俊 郑洪亮 詹成伟 田学雷 |
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| 作者单位： | 山东大学材料科学与工程学院材料液态结构及其遗传性教育部重点实验室,山东济南250061 |
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| 基金项目： | 国家自然科学基金（50395101） |
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| 摘 要： | 采用相场模型和有限差分方法，模拟了过冷纯金属熔体的枝晶生长，计算区域为二维正方形均匀网格．建立了不同热扩散条件下尖端过冷度、速度、半径随时间变化的关系；此外研究发现枝晶稳定生长时，其尖端过冷度和速度与热扩散系数成正比，尖端半径与热扩散系数成反比．
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| 关 键 词： | 相场 热扩散 枝晶生长 |
| 文章编号： | 1672-3961（2006）05-0005-04 |
| 收稿时间： | 2006-04-11 |
The effects of thermal diffusivity on dendrite growth in subcooled pure metals |
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| TIAN Wei-xing, SUN Jian-jun, ZHENG Hong-liang, ZHAN Cheng-wei, TIAN Xue-lei,. The effects of thermal diffusivity on dendrite growth in subcooled pure metals[J]. Journal of Shandong University of Technology, 2006, 36(5): 5-8 |
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| Authors: | TIAN Wei-xing SUN Jian-jun ZHENG Hong-liang ZHAN Cheng-wei TIAN Xue-lei |
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| Affiliation: | Key Laboratory of Liquid Structure and Heredity of Materials, Ministry of Education, School of material Science and Engineering, Shandong University, Jinan 250061, China |
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| Abstract: | Dendrite growth has been simulated with the phase field method and finite difference schemes on a two dimensional rectangular domain with a uniform square mesh. The relationships of dendrite tip subcooling, velocity and radius with dimensionless time have been established, respectively, at several thermal diffusivity levels. It is found that the dendrite steady-state tip subcooling and velocity are roughly in proportion to thermal diffusivity, respectively, and radius is in inverse proportion to thermal diffusivity. |
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| Keywords: | phase field thermal diffusivity dendrite growth |
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