以钛预合金化电解低钛铝合金为母材配制共晶铝硅合金ZL108Ti,研究了其组织细化的条件.结果表明:当钛含量为0.10%～O.13%时,合金表现出了较佳的组织细化效果和良好的力学性能.α-Al二次枝晶臂间距为16.71μm,共晶硅颗粒直径为2.69μm,室温和300℃抗拉强度比不含钛的ZLA08分别提高了5%和10%.组织细化机理主要是均匀弥散分布的溶质钛提供了足够的成分过冷,激发潜在强有力的形核相大量非均质形核,以及钛元素抑制晶粒长大的作用.
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