中文摘要：

利用电磁悬浮和快淬实验研究Cu60Co30Cr10合金在亚稳不混溶区的液相分离和快速凝固特征。结果表明,合金的显微组织为富（Co,Cr）相分布在富Cu相基体中,且富（Co,Cr）相颗粒的形状和大小随着冷却速率的变化而有明显的区别。在悬浮凝固条件下冷却速率较低,富（Co,Cr）相较粗大,有明显的聚集粗化趋势,富（Cu）相中有大量富（Co,Cr）相枝晶。而在快淬凝固条件下富（Co,Cr）相明显细化,富（Cu）相中未发现富（Co,Cr）相枝晶形成,这可能与较高的冷却速率、较大的过冷度和较高的界面张力有关。

英文摘要：

Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching.It is found that the alloy generally has a microstructure consisting of a（Co,Cr）-rich phase embedded in a Cu-rich matrix,and the morphology and size of the（Co,Cr）-rich phase vary drastically with cooling rate.During the electromagnetic levitation solidification processing the cooling rate is lower,resulting in an obvious coalescence tendency of the（Co,Cr）-rich spheroids.The（Co,Cr）-rich phase shows dendrites and coarse spheroids at lower cooling rates.In the splat quenched samples the（Co,Cr）-rich phase spheres were refined significantly and no dendrites were observed.This is probably due to the higher cooling rate,undercooling and interface tension.