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1 前言现在使用的铸造铝合金,即铸件与压铸件用的铝合金,几乎都是以Al-Si为基的二元Al-Si合金以及其中含少量Cu、Mg、Ni等其他元素的多元Al-Si系合金。这是因为:该系合金铸件和压铸件铸造时,其主要特性的熔体流动性和铸模填充性比其他合金的好,几乎不产生铸造裂纹,与其他元素相结合可以制得强度高的合金,尤其是热膨胀系数小和耐摩性好等原因。因此,铸件和压铸件加起来的铸造品其90％以上是以Al-Si系为
1 Preface Nowadays, the used aluminum alloy for casting, that is, the aluminum alloy for casting and die-casting are almost all Al-Si based binary Al-Si alloy and the multi-element Al containing a small amount of other elements such as Cu, Mg and Ni -Si alloy. This is because: the alloy castings and die-castings, when casting, the main characteristics of the melt flow and mold filling than other alloys, almost no casting cracks, combined with other elements can be made of high strength alloy , Especially the small coefficient of thermal expansion and abrasion resistance and other reasons. Therefore, more than 90% of the castings of castings and die-castings are based on Al-Si