利用熔铸法（Ｉ／Ｍ）生产出一种过共晶ＡｌＳｉ合金变质剂，并对其进行了金相显微观察和ＳＥＭ观察。试验结果表明，该变质剂在制备过程中直接生成了大量ＡｌＰ化合物，在熔融铝中熔化速度很快，对过共晶ＡｌＳｉ合金初晶Ｓｉ有良好的变质效果。对Ａｌ１８％Ｓｉ二元合金而言，Ｐ添加量控制在２０ｐｐｍ～８０ｐｐｍ，初晶硅平均尺寸可减小到２５μｍ～４０μｍ。 Using the casting method (I / M) to produce a hypereutectic AlSi alloy modifier, and its metallographic and SEM observations. The experimental results show that a large amount of AlP compounds are directly generated during the preparation of the modifier, melted rapidly in the molten aluminum and have a good metamorphic effect on the primary Si of the hypereutectic AlSi alloy. For Al18% Si binary alloys, the addition of P is controlled at 20ppm ~ 80ppm, the average primary Si can be reduced to 25μm ~ 40μm.