物理学报2011，Vol.60Issue(5)：757-765,9.
采用元胞自动机法模拟二元规则共晶生长
Modeling of regular eutectic growth of binary alloy based on cellular automaton method
摘要
Abstract
Based on cellular automaton method, a numerical model was developed for the regular eutectic growth of binary alloy.By coupling with the macro-temperature field and considering the solute diffusion, the constitutional undercooling and the curvature undercooling, modeling of the steady-state lamellar eutectic growth was achieved.A systematic investigation on eutectic growth morphology and lamellar spacing of a model alloy was made under unidirectional solidification conditions with different undercoolings, initial lamellar spacings, temperature gradients and solidification rates.The results reproduced the adjustment of lamellar spacing of two eutectic phases under the interaction between solute diffusion and surface energy by mechanisms of nucleation, lamellar branching, lamellar termination and overgrowth.The simulated results were in agreement with those predicted by the Jackson-Hunt model and experimental results by other researchers.Finally, the model was extended to three dimensional systems, which verified its feasibility of modeling the threedimensional eutectic growth.关键词
规则共晶/生长形貌/层片间距/CA方法Key words
regular eutectic/ growth morphology/ lamellar spacing/ cellular automaton method引用本文复制引用
吴孟武,熊守美..采用元胞自动机法模拟二元规则共晶生长[J].物理学报,2011,60(5):757-765,9.基金项目
国家科技重大专项(批准号:2009ZX04014-082),国家高技术研究发展计划(批准号:2009AA03Z114)和日本东洋机械金属株式会社国际合作项目(批准号:083000148)资助的课题. （批准号:2009ZX04014-082）
