研究了 Al-3B中间合金不同的加入量对亚共晶Al-Si合金晶粒尺寸的影响.该中间合金对所研究全部范围内的Al-Si合金都具有一定的细化效果,但在不同的含硅量下其细化能力并不相同.同时证实对未经细化处理的亚共晶Al-Si合金而言,在含硅量约3% (质量分数,下同) 时合金具有最小的晶粒尺寸.随着Al-3B中间合金加入量的提高,出现最小晶粒尺寸的合金成分向高硅方向移动,当加入量达到1%时,在含硅量为6%的Al-Si合金中出现最小的晶粒尺寸.
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