本文介绍了亚共晶Al-Si常用的细化剂和变质剂，分析和概括了现有的一些细化理论，如“包晶反应”、“颗粒理论”、“晶体增殖理论”、“超形核理论”，及变质理论，并简要讨论了化学细化法制备半固态亚共晶Al-Si合金。
In this paper the common fefiners and modifiers of hypoeutectic Al-Si alloys was introduced. Some refining mechanism, such as “Peritectic Reaction Theories”,“Particle Theories”,“Crystal Multiplication Theories”, “Super-Nucleation theories”, and modifying mechanism was analyzed. Finally the preparation of hypoeutectic Al-Si alloys by chemical refining method was briefly discussed.
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