【作者】 吕星； 杨湘杰； 桂云鹏；

【Author】 LV Xing;YANG Xiang-jie;GUI Yun-peng;School of Mechatronics Engineering,Nanchang University;Key Lab of Near Net Forming in JXp;School of Materials Science and Engineering,Nanchang University;

【机构】 南昌大学机电工程学院； 江西省高性能精确成形重点实验室； 南昌大学材料科学与工程学院；

【摘要】 以Al-Cu合金为研究对象,建立以元胞自动机和格子Boltzmann为基础的耦合模型,模拟晶粒在强迫对流环境中的枝晶生长演变过程。并以此为基础考察流动速度对晶体周围温度场和浓度场的影响、速度大小对枝晶生长形貌的影响以及处理任意择优角度下的晶体生长情况。模拟结果显示:速度场将会对温度场和浓度场出现非常明显的冲刷效果;速度的大小将会明显地改变枝晶形貌中上游和下游的主枝晶臂和二次枝晶臂的发育情况;在非特定的择优角度下,仍出现非常明显的流动速度对上下游温度场、浓度场和枝晶生长形貌的影响。更多还原

【Abstract】 Selecting Al-Cn alloy as studying object,a model coupled Cellular Automata with Lattice boltzmann model had been established and was used to simulate the dendrite growth under the condition of strong convection.On this basis,we studied the infiuence of the flow velocities on the temperature field and solubility field,and the impact of different velocities on the dendrite morphologies,and the dendrite growth with any preferred point of view.The results indicate that the velocity field will have a very significant erosion effect on the temperature field and solubility field;the velocity values will greatly change the size of the dendrite morphologies of the primary branches and the secondary dendrites;in any preferred point of view,the velocity values still obviously affect the up-wind and down-wind temperature field,solubility field and the morphologies of the dendrite growth.更多还原