Al－Si－Cu合金加入Sr复合变质剂的变质效果

The Modification Effect of Strontium-Containing Composite Modifier on Al-Si-Cu Alloy

用Ｓｒ、Ｎａ、Ｔｉ、Ｂ复合变质剂对Ａｌ－Ｓｉ－Ｃｕ亚共晶铸造合金进行变质处理，其作用与单独加Ｓｒ变质相比，能更好地细化共晶和晶粒，并具有良好的长效性。

The modificatim effect of strontium-.Sodium,titanium and boron-Containing Composite modifier on Al-Si-Cu alloy has been researched. Comparing with the Strontium-only Containing modifier,the composite modifier is more effective on grain refining of etectic structure,and the effectiveness is more prolongable.