中文摘要：

采用感应熔炼的方法研究了LaFe13-x-ySixCoy合金近平衡条件下的凝固行为。应用XRD和SEM扫描电镜分析了合金组织结构和相组成。结果表明：La（Fe，Co，Si）12相是包晶反应生成的，过冷度和添加Si、Co的含量对合金的凝固行为有很大影响；当过冷度△T≥40K，x=1．5时合金凝固组织中出现La（Fe，Co，Si）13相。应用经典形核理论对此进行了解释。

英文摘要：

Solidification behavior of LaFe13-x-ySixCoy Valloys was investigated by induction melting. Phase formation and structure in induction melted LaFe13-x-ySixCoy alloys have been investigated by means of power X-ray diffraction analysis （XRD） and scanning electron microscopy （SEM）. The results have shown that the phase is a peritectic phase. The solidification behavior of LaFe13-x-ySixCoy alloys is greatly affected by overcooling and amount of Si and Co additive. La（Fe,Co and Si ）13 phase occurs with x=1. 5 and overcooling temperature T≥40 K,as is interpreted by the classical nucleation theory.