采用电磁悬浮熔炼的方法研究了LaFe10.9Co0.6Si1.5合金的凝固行为.应用X射线衍射(XRD)和扫描电镜(SEM)分析了合金组织结构和相组成.结果表明:La(Fe,Si,Co)13相是包晶反应生成的,过冷度变化对合金的凝固行为有很大的影响,当△T≤10 K时,LaFe10.9Co0.6Si1.5合金显微组织由α-(Fe,Si)相和La(Fe,Co)Si相组成,α-(Fe,Si)相为主要相;当△T≥40 K时,LaFe10.9Co0.6Si1.5合金显微组织中出现La(Fe,Si,Co)13相,随过冷度增加La(Fe,Si,Co)13相增多.应用经典形核理论对此进行了解释.
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