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采用多相场模型对定向凝固过程中倾斜枝晶生长进行了研究,模拟了单一取向枝晶列的演化规律及不同取向枝晶列汇聚生长竞争淘汰行为.结果表明,枝晶尖端过冷度随倾斜角度的增大而增大,即相同条件下倾斜枝晶尖端位置总是低于非倾斜枝晶;汇聚生长时择优取向枝晶总是阻挡非择优取向枝晶,但在抽拉速度较低时,由于溶质扩散场的相互重叠,晶界处择优取向枝晶的生长受到相邻非择优枝晶的影响而延缓,这可能导致非择优取向枝晶淘汰择优取向枝晶.
The multiphase field model was used to study the growth of inclined dendrites in directional solidification process, and the evolution of uniaxial dendrite growth and the competition and phase-out behavior of dendrite growth were simulated.The results show that the degree of undercooling The tilted angle increases and increases, that is, the tip position of inclined dendrites is always lower than that of non-inclined dendrites under the same conditions; the preferred oriented dendrites always block the non-preferred oriented dendrites during the convergent growth, but when the drawing speed is low , The growth of the preferred oriented dendrite at grain boundaries is delayed by the influence of adjacent non-preferred dendrites due to the overlapping of solute diffusion fields, which may result in the elimination of preferential orientation dendrites by non-preferential orientation dendrites.