Sb+Ce复合变质对20Mg_2Si/Al-5Si复合材料中初生Mg_2Si相的影响

Effects of Complex Modification of Sb+Ce on the Primary Mg_2Si Phase in 20Mg_2Si/Al-5Si Composites

采用原位合成工艺制备了20Mg_2Si/Al-5Si复合材料,并研究了Sb+Ce复合变质对初生Mg_2Si相的影响。结果表明,当添加0.2%的Sb,随Ce添加量增加,初生Mg_2Si的平均尺寸呈现先减小后增加的趋势,初生Mg_2Si颗粒在0.2%的Sb+0.6%的Ce时最为细小,约为28μm,且分布均匀;0.4%的Sb+xCe复合变质时,有效细化了初生Mg_2Si相,其平均尺寸为30~40μm;0.6%的Sb+xCe复合变质时,初生Mg_2Si颗粒细化效果最佳,平均尺寸为27~31μm,且颗粒圆形度高,分布更加均匀。

The effects of complex modification of Sb＋Ce on the primary Mg2Si phase in 20%Mg2Si/Al-5Si composites fabricated by in situ reaction were investigated.The results reveal that the average size of the primary Mg2Si particles is decreased firstly and then increased with the 0.2%Sb＋xCe modification.The primary Mg2Si particles reach 28μm with uniform distribution with the addition of 0.2%Sb＋0.6%Ce.With the addition of 0.4%Sb＋xCe,the primary Mg2Si particles can be modified effectively and its average size reaches 30~40μm.The optimum modification effect can be observed with the addition of 0.6%Sb＋xCe,where average size of primary Mg2Si particles reaches 27~31μm with the higher roundness and more uniform distribution.