【摘要】 ZA27合金的凝固特性为典型的糊状凝固并具有比重偏析,为研究比重偏析,本文建立了两相流凝固模型,用Phoenics软件在三维柱坐标系中建模,用有限差分法离散。浓度场模拟结果表明铸件中铝元素有明显的成分偏析,与试验结果基本吻合。该凝固模型能较好地解决凝固过程中固液两相的对流问题,较好地模拟比重偏析现象。更多还原

【Abstract】 ZA27 alloy solidifies in the way of pastesolidification, and results in gravity segregation. The twophase flow model was built on the basis of the solidification characteristic of the ZnAl 27 alloy. And the equations were differentiated and computed in 3D cylindrical coordinates system by Phoenics. The computation of the composition field indicated a segregation of Al,and is in good agreement with the experiments. This model can simulate the convection and the gravitational segregation during the solidification.更多还原