低压铸造ZL114A铝合金微观组织模拟  

MICROSTRUCTURE SIMULATION OF ZL114A ALLOY DURING LOW PRESSURE DIE CASTING PROCESS

作　　者：李斌[1] 许庆彦[1] 潘冬[1] 柳百成[1] 熊艳才[2] 周永江[2] 洪润洲[2] 

机构地区：[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

出　　处：《金属学报》2008年第2期243-248,共6页Acta Metallurgica Sinica

基　　金：国家重点基础研究发展计划项目2005CB724105;国家自然科学基金项目10477010资助~~

摘　　要：在大最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.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.

关 键 词：铝合金 低压铸造 微观组织 数值模拟 形核模型 

分 类 号：TG244.3[金属学及工艺—铸造]