| Metastable liquid phase separation(MLPS) in Cu-Co-Fe ternary system was investigated using an electromagnetic levitation technique. The temperature of the metastable liquid phase separation(Tsep) was measured directly from the time-temperature profile during the cooling in levitated state. The metastable liquid miscibility boundary of the Cu-Co-Fe ternary was determined using the measured Tsep and the compositional analysis of the separated phases. Metastable liquid phase separated structures of Cu-Co-Fe system were found to be consistent with (Co, Fe)-Cu quasi binary phase diagram. In Cu-rich alloys, phase separation generally appeared as dispersed L1(Co, Fe rich phase) droplets in a L2(Cu rich phase) matrix, whereas for alloys containing Cu less than 45-47 wt%(depending on the alloy composition), L2 droplets formed in a L1 matrix. Secondary metastable liquid phase separation were observed in specimens which were cooled rapidly against a copper substrate. |
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