| 用颗粒推移模型模拟Al-Si/SiCp复合材料微观组织 |
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| 引用本文： | 李斌,许庆彦,李旭东,柳百成.用颗粒推移模型模拟Al-Si/SiCp复合材料微观组织[J].金属学报,2005,41(12):1303-1308. |
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| 作者姓名： | 李斌 许庆彦 李旭东 柳百成 |
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| 作者单位： | 1. 清华大学机械工程系,清华大学先进成形制造重点实验室,北京,100084
2. 兰州理工大学甘肃省有色金属新材料重点实验室,兰州,730050 |
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| 基金项目： | 国家重点基础研究发展规划项目G2000067208-3及兰州理工大学甘肃省有色金属新材料重点实验室项目资助 |
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| 摘 要： | 对搅拌铸造法制备SiC颗粒（SiCp）增强Al-7．0%Si（质量分数）复合材料的微观组织形成过程进行了模拟研究，建立了常规凝固条件下相应的宏观传热、等轴枝晶形核生长以及颗粒推移的二维计算模型，采用一种改进的CA（cellular automaton）方法与有限差分法耦合进行数值计算，研究了不同铸造方式对复合材料微观组织以及颗粒分布的影响．为了验证模拟结果，浇注了阶梯形金属型和砂型试样、结果表明，模拟得到的复合材料颗粒分布及微观组织与实验结果吻合良好．
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| 关 键 词： | 金属基复合材料 颗粒推移 微观组织 数值模拟 |
| 文章编号： | 0412-1961（2005）12-1303-06 |
| 收稿时间： | 2005-04-14 |
| 修稿时间： | 2005-04-142005-06-22 |
MICROSTRUCTURE SIMULATION OF Al-Si/SiCp COMPOSITES WITH PARTICLE PUSHING MODEL |
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| LI Bin,XU Qingyan,LI Xudong,LIU Baicheng.MICROSTRUCTURE SIMULATION OF Al-Si/SiCp COMPOSITES WITH PARTICLE PUSHING MODEL[J].Acta Metallurgica Sinica,2005,41(12):1303-1308. |
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| Authors: | LI Bin XU Qingyan LI Xudong LIU Baicheng |
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| Affiliation: | 1. Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Department of Mechanical Engineering, Tsinghua University, Beijing 100084 ;2. Nonferrous Metal New Materials Key Laboratory of Gansu Province, Lanzhou University of Science and Technology, Lanzhou 730050 |
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| Abstract: | The microstructure of SiC particle reinforced Al-7.0%Si (mass fraction) composite prepared by stir casting was simulated by a modified cellular automaton method coupled with finite difference method and two-dimensional models under normal solidification condition including macro heat transfer, nucleation, equiaxed dendrite growth and particle pushing. The effects of different casting processes on composite microstructure and particle distribution were analyzed. The simulated results can clearly show the evolution of the microstructure of composite and particle clustering phenomena caused by particle pushing. The simulated results are in good agreement with the experimental results. Grain size is smaller and particle distribution is more uniform for metal mould casting than sand mould casting. |
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| Keywords: | metal matrix composite particle pushing microstructure numerical simulation |
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