(1. 西安交通大学 理学院材料物理系， 西安 710049;
2.西北工业大学 物理系， 西安 710072)
摘 要: 用金相分析法对含10%～30%Co-Cu合金液态深过冷条件下的液相分解行为进行了研究。结果表明，在深过冷条件下Cu-Co合金首先形成富Co的α枝晶；由于α-Co 枝晶的分数小于平衡凝固态，剩余液相是过饱和的；当液态合金过冷到液相分解区后，将分解成富Cu和富Co的两个液相。Cu-Co合金液相分解过程包括富Co液滴的形成、长大、积聚及富Co液滴的二次相分解。首次观察到在过饱和的富Cu液相发生液相分解后，原始枝晶重熔并参与液相分解的反常现象。
关键字: 深过冷； 液相分解； Cu-Co合金； 金相组织
under deep supercooling
（1. Department of Materials Physics, Faculty of Science, Xi'an Jiaotong Universty，
Xi′an 710049, P.R.China;
2. Department of Physics, Northwestern Polytechnical University, Xi′an 710072, P.R.China）
Abstract:The liquid separation behaviors of 10%～30% Co-Cu alloys were investigated by means of melt glass deep supercooling technology. The results reveal that α-Co dendrites are firstly crystallized under the condition of deep supercooling. Because the fraction of α-Co dendrites is less than that of equilibrium condition， the remnant liquid phase is supersaturated. When temperature is below the liquid separation line, the melt will separate into the Co-rich and Cu-rich liquid phases. Separation process includes formation, growth, collection of liquid drops and coarseness of Co-rich clusters. The abnormal phenomena that the primitive dendrites remelt and participate in liquid separating after supersaturating liquid separation were observed firstly.
Key words: deep supercooling； liquid separation； Cu-Co alloy； microstructure
