通过合金液电阻率测定及差热分析，发现铝硅合金的物理性能与温度关系曲线在液相线以上存在明显转折，结合对铝硅合金液态激冷试样的透射电镜观测，证实铝硅合金在液态也有结构转变；将转变区以上的高温铝硅合金液快速冷至正常浇注温度浇注，合金的力学性能显著提高，抗拉强度提高１７％，延伸率提高１倍。 Through liquid-phase resistivity measurement and differential thermal analysis, it is found that the physical properties and temperature curves of aluminum-silicon alloy have obvious transitions above the liquidus. Combined with the transmission electron microscope observation of liquid-cooled samples of Al-Si alloy, In the liquid also have structural changes; the transition zone above the high temperature aluminum-silicon alloy liquid rapid cooling to normal casting temperature pouring, the mechanical properties of the alloy significantly improved tensile strength increased by 17%, the elongation increased by 1 times.