| 低压铸造ZL114A铝合金微观组织模拟 |
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| 引用本文： | 李斌,许庆彦,潘冬,柳百成,熊艳才,周永江,洪润洲.低压铸造ZL114A铝合金微观组织模拟[J].金属学报,2008,44(2):243-248. |
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| 作者姓名： | 李斌 许庆彦 潘冬 柳百成 熊艳才 周永江 洪润洲 |
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| 作者单位： | 1. 清华大学机械工程系,先进成形制造教育部重点实验室,北京,100084
2. 北京航空材料研究院,北京,100095 |
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| 基金项目： | 国家重点基础研究发展计划(973计划)
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国家自然科学基金 |
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| 摘 要： | 在大量实验数据统计分析的基础上,建立了低压铸造ZL114A铝合金形核模型,得到了相关热力学,动力学参数.采用了一种改进的Celluar Automaton方法耦合有限差分法对合金的宏观凝固及微观组织演化过程进行了数值模拟.考虑了固/液界面的溶质再分布、微观固相分数、曲率以及各向异性因素.利用阶梯铸件研究了不同冷却速度下晶粒度、二次枝晶臂间距以及共晶组织含量的变化规律,并将模拟值与实验值进行了对比验证.
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| 关 键 词： | 铝合金 低压铸造 微观组织 数值模拟 形核模型 |
| 文章编号： | 0412-1961（2008）02-0243-06 |
| 收稿时间： | 2007-04-18 |
| 修稿时间： | 2007-09-24 |
STUDY ON MICROSTRUCTURE SIMULATION OF ZL114A ALLOY DURING LOW PRESSURE DIE CASTING PROCESS |
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| LI Bin,XU Qingyan,PAN Dong,LIU Baicheng,XIONG Yancai,ZHOU Yongjiang,HONG Runzhou.STUDY ON MICROSTRUCTURE SIMULATION OF ZL114A ALLOY DURING LOW PRESSURE DIE CASTING PROCESS[J].Acta Metallurgica Sinica,2008,44(2):243-248. |
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| Authors: | LI Bin XU Qingyan PAN Dong LIU Baicheng XIONG Yancai ZHOU Yongjiang HONG Runzhou |
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| Abstract: | Based on the statistical analysis of a number of experimental data, a nucleation model was developed and the related thermodynamics and kinetics parameters were presented for low pressure die casting of ZLll4A aluminum alloy. A modified CA-FD method was proposed to simulate macro solidification process and microstructure evolution of the alloy. The preferential growth orientation, solute redistribution in both liquid and solid, solid/liquid interface curvature and growth anisotropy were all considered in the model. The grain size, secondary dendrite arm spacing and eutectic volume fraction of the alloy at different cooling rates were predicted and compared with experimental results of step-shaped sample casting. |
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| Keywords: | aluminum alloy low pressure die casting microstructure numerical simulation nucleation model |
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