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| 过冷对纯镍熔体凝固过程中树枝晶侧向分枝的影响 | |
| 引用本文： | 田卫星,刘健,苏玉阔,李兴文,田学雷. 过冷对纯镍熔体凝固过程中树枝晶侧向分枝的影响[J]. 山东大学学报(工学版), 2007, 37(1): 6-9 |
| 作者姓名： | 田卫星 刘健 苏玉阔 李兴文 田学雷 |
| 作者单位： | 1. 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 2. 山东大学,工程训练中心,山东,济南,250061 3. 济南二机床集团有限公司,山东,济南,250062 |
| 摘 要： | 在相场模拟中，通过捕获液态界面，系统研究了过冷对纯金属熔体凝固过程中树枝晶侧向分枝形貌的影响.结果表明，随着熔体过冷度的增大，晶体中二次枝晶越来越发达，其百分含量线性增加；当过冷度足够大时，一次枝晶可能发生缩颈，并在对流作用下于缩颈处熔断，导致晶粒的自身细化. |
| 关 键 词： | 起伏 树枝晶 相场方法 |
| 文章编号： | 1672-3961(2007)01-0006-04 |
| 收稿时间： | 2006-10-11 |
| 修稿时间： | 2006-10-11 |
Effects of supercooling on dendritic side-branching during solidification of pure Ni melt |
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| TIAN Wei-xing,LIU Jian,SU Yu-kuo,LI Xing-wen,TIAN Xue-lei. Effects of supercooling on dendritic side-branching during solidification of pure Ni melt[J]. Journal of Shandong University of Technology, 2007, 37(1): 6-9 | |
| Authors: | TIAN Wei-xing LIU Jian SU Yu-kuo LI Xing-wen TIAN Xue-lei |
| Affiliation: | 1. Key Laboratory of Liquid Structure and Heredity of Materials,Ministry of Education,School of material Science and engineering,Shandong University,Jinan 250061,China;2. Engineering Training Center,Shandong University,Jinan 250061,China |
| Abstract: | Side-branching of dendrites during solidification of pure Ni melt was studied via simulation by using a modified phase-field model which incorporates both structural fluctuation and energetic fluctuation.The results indicate that with increasing under-cooling,side branching intensifies and neck shrinkage can be found in the trunk.The trunk will probably rupture when convection happens,and will result in spontaneous grain refinement in deeply undercooled melts. |
| Keywords: | fluctuations dendrite phase field method |
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