复合变质对过共晶Al-24%Si合金组织的影响

Effect of Compound Modification on Structure of Hypereutectic Al-24% Si Alloy

对过共晶Al-24%Si合金进行了单一磷、稀土及磷和稀土双重复合变质处理。实验表明,磷和稀土双重复合变质能够有效的细化合金的组织,变质后合金中的初晶硅晶粒平均尺寸由变质前的60μm变为20μm,且分布均匀,共晶硅也由长针状变为短杆状。同时对磷和稀土的双重复合变质机理做了初步探讨。

Double compound modification was carried out for hypereutectic Al-24%Si alloy. The experiment showed that double modification with phosphorus and rare earth can fine the structure of alloy. Average grain size of alloy is 20μm afer modification with uniform distribution, while it was 60μm before modification. Mechanism of double compound modification with phosphorus and rare earth is discussed as well .