| 脉冲电流作用下纯铝熔体凝固晶核的迁移行为(英文) |
| |
| 引用本文： | 李希彬,芦凤桂,崔海超,唐新华.脉冲电流作用下纯铝熔体凝固晶核的迁移行为(英文)[J].中国有色金属学会会刊,2014,24(1):192-198. |
| |
| 作者姓名： | 李希彬 芦凤桂 崔海超 唐新华 |
| |
| 作者单位： | 上海交通大学 材料科学与工程学院,上海200240 |
| |
| 基金项目： | Project （SELF-2011-01） supported by the Open Project of Shanghai Key Laboratory of Modern Metallurgy and Materials Processing, China，Projects （51204109,51035004） supported by the National Natural Science Foundation of China |
| |
| 摘 要： | 建立凝固过程的数学模型来揭示自由晶核的迁移行为。模拟结果表明:在脉冲电流作用下,大多数形成于熔体上表面的晶核将往下迁移并随机分布于Al熔体内部,提供更多的形核质点,进而细化凝固组织晶粒。同时,研究在施加脉冲电流(ECP)时晶核尺寸对晶核分布和细化的影响。小尺寸的晶核同周围熔体一同运动,迁移距离较短;而大尺寸的晶核在脉冲电流作用下以较快的速度相对于周围熔体运动,有利于熔体内部晶粒的细化。该研究有利于加深对脉冲电流细化凝固组织机理的认识。
|
| 关 键 词： | 脉冲电流 凝固 细化机制 晶核迁移 数值模拟 |
| 收稿时间： | 23 February 2013 |
Migration behavior of solidification nuclei in pure Al melt under effect of electric current pulse |
| |
| Xi-bin LI,Feng-gui LU,Hai-chao CUI,Xin-hua TANG.Migration behavior of solidification nuclei in pure Al melt under effect of electric current pulse[J].Transactions of Nonferrous Metals Society of China,2014,24(1):192-198. |
| |
| Authors: | Xi-bin LI Feng-gui LU Hai-chao CUI Xin-hua TANG |
| |
| Affiliation: | (School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China) |
| |
| Abstract: | A mathematical model considering free nuclei was developed to reveal the migration behavior of the free nuclei. Numerical simulation results show that most of the nuclei on the top surface of the melt move downwards and distribute randomly inside the Al melt, which induces more nucleation sites resulting in grain refinement. At the same time, the effect of nuclei size on the nuclei distribution and refinement employing electric current pulse （ECP） was also investigated. The smaller nuclei migrate a short distance with the Al melt at lower speed. But for the larger nuclei, the migration downwards with higher speed benefits the refinement of interior grains of the melt. The research results help to better understand the refinement process and provide a more reasonable explanation of the grain refinement mechanism using ECP. |
| |
| Keywords: | electric current pulse solidification process grain refinement mechanism migration behavior numerical simulation |
| 本文献已被 CNKI 维普 ScienceDirect 等数据库收录！ |
