分析了难混溶合金凝固过程中作用在凝固界面前沿液滴上的力，建立了液滴与凝固界面相互作用行为的动力学判据。理论与实验相结合，探讨了固/液界面与液滴间相互作用对Al-Bi基难混溶合金凝固组织演变的影响。研究结果表明，在界面排斥和Marangoni力共同作用下，较小尺寸的富Bi液滴被凝固界面排斥并富积在凝固界面前沿。当凝固界面为枝晶/胞状晶时，临界尺寸的富Bi液滴与界面发生部分捕获，凝固后形成“蝌蚪”型的富Bi粒子；尺寸较小的富Bi液滴被捕获在枝晶/胞状晶间，凝固后富Bi粒子分布于晶界和三叉交角处。
The forces acting on the sphere in front of the S/L interface during the solidification of immiscible alloys have been analyzed. The dynamic criterion for the interaction mode between the sphere and solidification interface has been proposed. Combining theory with experiment, the effect of the interaction between the S/L interface and the sphere on the microstructure development in the Al-Bi based immiscible alloy has been discussed in detail. The results have indicated that the small Bi-rich spheres were repelled and accumulated in front of the solidification interface due to the combined action of the interfacial repulsion and Marangoni migration. If the interface morphology is dendritic or cellular, the Bi-rich sphere with critical size is partially entrapped by the interface and forms tadpole-type particle. While, the smaller Bi-rich spheres will be entrapped in the interdendrite and the Bi-rich particles distribute at the grain boundaries and the triple junctions after solidification.
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