对Ti Al合金常规凝固条件下微观组织形成过程进行了模拟研究,建立了相应的宏观传热、等轴枝晶形核生长二维数学模型,采用一种改进的CA方法与有限差分法耦合进行凝固过程数值计算。结果表明,初生β相形态与实验结果符合较好。在散热小的中心区域,一次枝晶容易长成纺锤形。 The microstructure evolution of TiAl alloy under conventional solidification conditions was simulated and the corresponding two-dimensional mathematical model of macroscopic heat transfer and equiaxed dendrite nucleation growth was established. An improved CA coupled with finite difference method was used to solidify Process Numerical Calculation. The results show that the morphology of primary β phase is in good agreement with the experimental results. In the central area of ​​small heat, a dendrite easy to grow spindle shape.