镁合金铸造成形过程宏观/微观模拟  

Macro/Micro Modeling of Casting Process of Magnesium Alloys

作　　者：熊守美[1] 荆涛[1] 韩志强[1] 

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《中国材料进展》2010年第11期55-62,47,共9页Materials China

基　　金：国家973计划项目(2006CB605208);国家863计划项目(2009AA03Z114)

摘　　要：通过研究镁合金压铸过程中界面热,采用热传导反算法确定压铸过程的界面换热系数,研究镁合金压铸过程中工艺参数及凝固过程对铸件界面换热系数的影响规律,建立镁合金压铸过程界面换热边界条件的处理模型,以实现镁合金压铸过程中凝固过程的准确预测。通过实验研究镁合金压铸过程中凝固组织,建立了镁合金压铸过程中形核模型。采用CA方法,建立了镁合金枝晶生长模型,以实现镁合金凝固组织的预测。采用相场方法研究了镁合金枝晶生长形貌。The interracial heat transfer behavior in high pressure die casting （ HPDC ） process of magnesium alloy was firstly studied. The interfacial heat transfer coefficient （IHTC） was determined by the inverse heat transfer estimation method and the influence of the processing parameters and the solidification process on the IHTC of HPDC process was investigated. A thermal boundary condition model for the HPDC process of magnesium alloy was finally developed so that the solidification process of high pressure die cast magnesium alloys could be accurately predicted. Besides, a nucleation model of magnesium alloy for the HPDC process was established by experimentally studying the solidification microstructure of magnesium alloy HPDC process and the cellular automaton（CA） was used to model the crystal growth of magnesium alloys to predict the solidification structure. The three dimensional morphology of the dendrite growth of magnesium alloys was also studied by using phase field method.

关 键 词：镁合金 铸造成形 宏观/微观模拟 

分 类 号：TG244[金属学及工艺—铸造] O242[理学—计算数学]