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为分析过共晶铝硅合金组织对其切削加工性能的影响，对两种化学成分相同但是组织结构不同的过共晶铝硅合金进行了切削试验研究并探讨了其切削机理。试验结果表明：过共晶铝硅合金经变质处理后组织中初晶硅的大小、形状和分布状况对切削刀具寿命和合金的切削加工表面质量影响极大，具有细小、分散而形状圆钝化初晶硅的合金有比较好的切削性能。造成这种影响的主要原因在于细小的硅粒比较容易协同基体塑性变形和被刀具压入切屑和已加工表面，而粗大的硅块往往发生解理破碎、脱落和位移，直接与刀具发生强烈摩擦并使已加工表面存留许多缺陷。
In order to analyze the influence of hypereutectic Al-Si alloy on its machinability, two kinds of hypereutectic Al-Si alloys with the same chemical composition but different microstructures were studied by cutting test and the cutting mechanism was discussed. The experimental results show that the size, shape and distribution of primary silicon in the hypereutectic Al-Si alloy have a great influence on the cutting tool life and the machined surface quality of the alloy, and have the characteristics of small, dispersed and round passivated The primary silicon alloy has better cutting performance. The main reason for this effect is that the smaller silicon particles are easier to co-operate with the plastic deformation of the substrate and the chips are pressed into the machined surface by the tools. However, the coarse silicon blocks often cleave, fall off and displace directly and strongly rub against the tool And left many defects on the machined surface.