中国有色金属学报(英文版)
Transactions of Nonferrous Metals Society of China
Vol. 12 No. 3 June 2002 |
development in rapidly directionally solidified immiscible alloys
(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