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通过对颗粒增强金属基复合材料凝固过程中温度场、质量分数场变化以及凝固前沿形状改变的数值模拟，建立了颗粒被凝固前沿排斥或捕获的监界速度模型．当凝固前沿的推进速度小于颗粒被凝固前沿所排斥／捕获的临界速度时，颗粒被凝固前沿所捕获的现象不会发生，并且在临界速度模型中保持其它参数为常量，而只考虑合金质量分数的影响时，发现随着合金质量分数的逐渐增加，颗粒被凝固前所排斥／捕获的临界速度逐渐减小。
Through the numerical simulation of the change of temperature field, mass fraction field and the shape change of the solidification front during the solidification process of particle reinforced metal matrix composites, the critical speed model of particle rejection or capture by solidification front was established. When the advancing front of the solidification is less than the critical speed of particle rejection / capture by the solidified front, the phenomenon that the particles are captured by the solidification front does not occur and the other parameters are kept constant in the critical velocity model, and only the alloy mass fraction , It is found that with the increasing of alloy mass fraction, the critical velocity of rejection / capture before the particles are solidified gradually decreases.