研究了三种Al-Si合金在熔体流动下的Si相形态和共晶凝固特点,结果表明:在强迫流动熔体中生长的共晶Si形态取决于流动速度、疑团速度和共晶凝固分数,共晶Si由片状变为颗粒状和短棒状.文中对粒化机理进行了分析,提出了一种共晶si粒化的新途径.近共晶流变Al-Si合金中的离异共晶,分为三种类型:薄膜、晕轮和Si相与α相分别单独生长型. The Si phase morphology and eutectic solidification characteristics of three Al-Si alloys under melt flow were investigated. The results show that the morphology of eutectic Si grown in the forced flow melt depends on the flow rate, the rate of the suspect mass, and the eutectic solidification fraction , The eutectic Si changes from flake to granular and short rod.The mechanism of granulation is analyzed and a new way of eutectic si granulation is proposed.It is known that the eutectic Crystal, divided into three types: film, halo and Si phase and alpha phase were isolated growth type.