발간논문

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Vol.38, No.9, 1153 ~ 1160, 2000
Title
The Effect of Cooling Rate on Metastable Liquid Phase Separation
김동익Dong Ik Kim , Reza Abbaschian
Abstract
The effect of cooling rate on the metastable liquid phase separation(MLPS) in Cu-Fe binary and Cu-Fe-Co ternary alloys was investigated using an electromagnetic levitation technique. The cooling rate during phase separation was controlled by dropping the specimens to copper substrate which was in 15 ㎝ apart from levitation coil. The cooling rate in levitation state was 5-20 Ｋ/sec, and those of free falling and after splash were 130 Ｋ/sec and 2300 Ｋ/sec respectively. In the specimen solidified at medium cooling rate(about 130 Ｋ/sec), secondary phase separation was observed in both L1(Fe- or Fe, Co-rich phase) and L2(Cu-rich phase) phases that have been formed by primary phase separation. In this case the phase separation occured by nucleation and growth. Spinodal decomposition is considered as a dominent phase separation mechanism in L1 droplets solidified at fast cooling rate (about 2300 K/sec). There was no evidence of spinodal decomposition in L2 phase.
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