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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 11    No. 6    December 2001

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Liquid separation behavior of Cu-Co alloy during
isothermal process at high temperature
SUN Zhan-bo(孙占波), HU Zhu-dong(胡柱东), SONG Xiao-ping(宋晓平),
LIU Jian(刘  剑), YANG Sen(杨  森), LI Xiao-yuan(李晓园), ZHU Yao-min(祝要民)

School of Science, Xi′an Jiaotong University, Xi′an 710049, P.R.China

Abstract: Liquid separation of Cu75Co25 and Cu85Co15 alloys at various supercoolings was investigated employing glass flux technology. The results reveal that during the course of isothermal processes, liquid separation develops more fully than in the continuous cooling, which results in more and larger particles. Further thermodynamic analyses indicate that primary dendrites from liquid separation are inclined to remelt in Cu liquid and finally the dendrites shrink locally, or even break into fragments. The fragments clash each other and grow into larger Co-rich particles due to electromagnetic force. It is also showed that at constant temperature whether Co-rich particles solidify depends on the develop level of the liquid separations. Co-rich liquid droplets begin to solidify when the component of Co-rich liquid reaches the solidus.

 

Key words:  Cu-Co alloys; liquid separation; supercooling; solidification

ISSN 1672-7029
CN 43-1423/U

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