Microstructures Of Rapidly Solidified Cu--Fe Immiscible Alloy

Acta Metall Sin

2005, Vol. 41

Issue (4): 407-410 DOI:

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Microstructures Of Rapidly Solidified Cu--Fe Immiscible Alloy

HE Jie; ZHAO Jiuzhou

Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110016

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HE Jie; ZHAO Jiuzhou. Microstructures Of Rapidly Solidified Cu--Fe Immiscible Alloy. Acta Metall Sin, 2005, 41(4): 407-410 .

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Abstract Fine powders of the Cu-Fe alloy were manufactured by using the high-pressure gas atomization technique. The study of the powder microstructures indicated that the size and concentration of the atomized-droplets play important roles in the microstructure evolution. A smaller atomized-droplet has a finer dispersed microstructure. Alloys with composition close to the critical composition of the alloy system are relatively easy to be undercooled into the miscibility gap. The formation of Fe--poor layer on the surface of powder is mainly caused by two reasons. One is the Fe-rich droplets' Marangoni migration towards the center of the atomized-droplet due to the radial temperature gradient, and the other is the repulsive effect of the advancing solid-liquid interface on the Fe-rich droplets.

Key words: Cu--Fe alloy metastable miscibility gap

Received: 02 June 2004

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