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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 12    No. 3    June 2002

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Model for calculation of microstructural
 development in rapidly directionally solidified immiscible alloys
ZHAO Jiu-zhou(赵九洲)

Institute of Metal Research, The Chinese Academy of Sciences,
Shenyang 110016, China

Abstract:A model has been developed for the calculation of the microstructural evolution in a rapidly directionally solidified immiscible alloy. Numerical solutions have been performed for Al-Pb immiscible alloys. The results demonstrate that at a higher solidification velocity a constitutional supercooling region appears in front of the solid/liquid interface and the liquid-liquid decomposition takes place in this region. A higher solidification velocity leads to a higher nucleation rate and, therefore, a higher number density of the minority phase droplets. As a result, the average radius of droplets in the melt at the solid/liquid interface decreases with the solidification velocity.

 

Key words: immiscible alloy; directional solidification; microstructure; theory and modeling

ISSN 1672-7029
CN 43-1423/U

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