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Rapid solidification behavior of Cu–Co–Fe alloy

Published online by Cambridge University Press:  19 April 2013

Lei Zhao  and
Jiu Zhou Zhao
Lei Zhao*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning 110016, People’s Republic of China
Jiu Zhou Zhao*
Affiliation:
Institute of Metal Research, Chinese Academy of Sciences, Shenyang, Liaoning 110016, People’s Republic of China
*
a)Address all correspondence to this author. e-mail: jzzhao@imr.ac.cn
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Abstract

The ternary Cu–Co–Fe alloy was rapidly solidified by using the high pressure gas atomization technique. Powders with a well-dispersed microstructure resulting from the liquid–liquid phase transformation were obtained. A model describing the microstructure evolution in an atomized drop during the liquid–liquid phase transformation was developed. The kinetic details of the liquid–liquid phase transformation were discussed. The numerical results show a favorable agreement with the experimental ones. They demonstrate that under the rapid cooling conditions of gas atomization, the spatial phase separation due to the Marangoni migration of the minority phase droplets is very weak. Also, the effect of Ostwald coarsening of the minority phase droplets on the microstructure is negligible. For Cu-10 wt% Co-10 wt% Fe alloy, the average radius and number density of the Fe–Co-rich particles depend exponentially on the cooling rate of the melt during the nucleation period of the Fe–Co-rich droplets.

Keywords

rapid solidificationmicrostructuresimulation
Type
Articles
Information
Journal of Materials Research , Volume 28 , Issue 9 , 14 May 2013 , pp. 1203 - 1210
Copyright
Copyright © Materials Research Society 2013 

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