一、绪言 晶粒细化处理作为进一步提高铸造Al合金性能的一种重要手段,近年来得到了广大铸造工作者的高度重视。 国内外对Ca的作用,尚缺乏深入的研究,存在着不同的看法。作者在实验室条件下,首先考察了Ca的化合物对共晶Al—Si合金共晶团的细化作用,在此基础上,进一步探讨了加入Ca化合物的细化处理工艺及其对合金宏观组织,微观组织和机械性能的影响。 I. INTRODUCTION As an important means to further improve the properties of the cast Al alloy, the grain refinement treatment has gained great attention from the majority of foundry workers in recent years. The role of Ca at home and abroad, there is a lack of in-depth research, there are different views. Under laboratory conditions, the author first investigated the refining effect of Ca compounds on the eutectic Al-Si alloy eutectic. On the basis of this, we further discussed the refinement process of adding Ca compounds and its effect on the microstructure of alloy , Microstructure and mechanical properties.