中國(guó)有色金屬學(xué)報(bào)(英文版)
Transactions of Nonferrous Metals Society of China
| Vol. 18 No. 3 June 2008 |
（1. School of Science, Shaanxi Key Laboratory of Condensed Matter Structures and Properties,Northwestern Polytechnical University, Xi’an 710072, China;2. Department of Basic Courses, Xi’an University of Science and Technology, Xi’an 710054, China）
Abstract:Numerical simulation based on phase field method was developed to describe the solidification of two-dimensional isothermal binary alloys. The evolution of the interface morphology was shown and the effects of phase field parameters were formulated for succinonitrile-acetone alloy. The results indicate that an anti-trapping current(ATC) can suppress many trapped molten packets, which is caused by the thickened interface. With increasing the anisotropy value from 0 to 0.05, a small circular seed grows to develope secondary dendritic, dendritic tip velocity increases monotonically, and the solute accumulation of solid/liquid interface is diminished distinctly. Furthermore, with the increase of the coupling parameter value, the interface becomes unstable and the side branches of crystals appear and grow gradually.
Key words: phase field method; succinonitrile-acetone alloy; dendritic growth; tip velocity; anti-trapping current; anisotropy
