几年前,就介绍了某些过渡金属作为熔体添加剂可使铸铝晶粒细化。这已广泛用于工业上,尤以钛作晶核剂时细化效果最佳。一般把中间合金加到静置炉或铸造流槽的熔体内。最常用的是成分为Al-5％Ti-1％B(重量比,下同)的中间合金,也可用铝钛中间合金。图1为A1-Ti、A1-Zr、Al-Nb合金相图 A few years ago, introduced some of the transition metal as a melt additive can refine the cast aluminum grain. This has been widely used in industry, especially when using titanium as a nucleating agent, the refining effect is best. The master alloy is usually added to the melt in a static furnace or casting runner. The most commonly used is the composition of Al-5% Ti-1% B (weight ratio, the same below) of the master alloy, aluminum-titanium master alloy can also be used. Figure 1 is A1-Ti, A1-Zr, Al-Nb alloy phase diagram