Novel insight into microstructural evolution of phase-separated Cu–Co alloys under influence of forced convection
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Cu–Co alloys of bulk compositions Cu75Co25 and Cu84Co16 were undercooled and solidified using electromagnetic levitation. Microstructure of the samples was characterized using optical microscopy, scanning electron microscopy, energy dispersive spectrometry, and micro X-ray diffraction analysis. It was found that besides a bimodal size distribution, droplets of the Co-rich L1 phase resulting from liquid phase separation have a broad composition distribution. The bimodal size distribution of the droplets is more pronounced for the Cu75Co25 sample than for the Cu84Co16 sample, whilst the composition distribution of the droplets is broader in the Cu75Co25 sample than in the Cu84Co16 sample. The droplets were found to also have different types of substructures in the two samples. The results provide novel insight into microstructural evolution of phase-separated alloys under influence of forced convection.
KeywordsForced Convection Primary Peak Liquid Phase Separation Bimodal Size Distribution Co75Co25 Sample
This work is financially supported by the Fundamental Research Funds for the Central Universities under grant Nos. N090109001 and N100309001. Part of work is supported by the Deutsche Forschungsgemeinschaft within grant HE1601/22-1.
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