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Vol.38, No.1, 14 ~ 21, 2000
Title
Pesearch Paper / Transformations : Matastable Liquid Phase Separation and Microstructure in Cu-Co Alloys
김동익Dong Ik Kim,Reza Abbaschian
Abstract
Metastable liquid phase separation(MLPS) in Cu-Co binary system was investigated using an electromagnetic levitation technique. In Co-rich alloys, Phase separation generally appeared as dispersed L2(Cu-rich) droplets in a L1(Co-rich) matrix, whereas for alloys containing Co less than 55 wt%, L1 droplets formed in a L2 matrix. Secondary MLPS was occurred in the primary separated L1 droplets by increasing the cooling rate during phase separation. The effect of undercooling and cooling rate on the microstructure of L1 phase was investigated. The microstructure of L1 phase was found to fall into three categories of dendrite, spherical and mixed (dendritic plus spherical) morphology. As the undercooling and/or cooling rate was increased the spherical morphology became a dominent structure.
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