在铝硅铸造合金组织中,由于共晶体中的硅以针片状存在,割裂了合金基体,恶化了合金性能。为改善和消除这种不利影响,目前主要有两种方法,一是采用金属型铸造,用提高过冷度来控制硅的相的形态、大小和分布,一是采用变质处理方法,使针状硅球化和细化, In Al-Si alloyed alloys, the alloy matrix is ​​degraded due to the presence of silicon in the eutectic in the form of needles. In order to improve and eliminate this adverse effect, there are mainly two methods at present. One is to use metal casting, and the control of the shape, size and distribution of the silicon phase by increasing the degree of supercooling. The first method is to use metamorphic treatment to make acicular Silicon ball and refinement,