(1. 西安交通大學 理學院材料物理系， 西安 710049;
2.西北工業(yè)大學 物理系， 西安 710072)
摘 要: 用金相分析法對含10%～30%Co-Cu合金液態(tài)深過冷條件下的液相分解行為進行了研究。結(jié)果表明，在深過冷條件下Cu-Co合金首先形成富Co的α枝晶；由于α-Co 枝晶的分數(shù)小于平衡凝固態(tài)，剩余液相是過飽和的；當液態(tài)合金過冷到液相分解區(qū)后，將分解成富Cu和富Co的兩個液相。Cu-Co合金液相分解過程包括富Co液滴的形成、長大、積聚及富Co液滴的二次相分解。首次觀察到在過飽和的富Cu液相發(fā)生液相分解后，原始枝晶重熔并參與液相分解的反常現(xiàn)象。
關(guān)鍵字: 深過冷； 液相分解； Cu-Co合金； 金相組織
under deep supercooling
CAO Chong-de２, WEI Bing-bo２
（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
