Simulation of microstructural evolution in directional solidification of Ti-45at.%Al alloy using cellular automaton method

作     者：Wang Kuangfei Lu Shan Mi Guofa Li Changyun FU Hengzhi 

作者机构：School of Materials Science and Engineering Henan Polytechnic University Jiaozuo 454100 China School of Electromechanical Engineering Jiaozuo University Jiaozuo 454100 China 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2010年第7卷第1期

页      面：47-51页

核心收录：

学科分类：080503[工学-材料加工工程] 0806[工学-冶金工程] 08[工学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 0802[工学-机械工程] 0702[理学-物理学] 080201[工学-机械制造及其自动化] 

主　　题：Al合金 数值模拟 凝固微观组织 演变 自动机 高温度梯度 树突细胞 钛 

摘      要：The microstructural evolution of Ti-45 at.%Al alloy during directional solidification was simulated by applying a solute diffusion controlled solidification *** obtained results have shown that under high thermal gradients the stable primary spacing can be adjusted via branching or competitive *** dendritic structures formed under a high thermal gradient,the secondary dendrite arms are developed not very well in many cases due to the branching mechanism under a constrained dendritic growth ***,it has been observed that,with increasing pulling velocity,there exists a cell/dendrite transition region consisting of cells and dendrites,which varies with the thermal gradient in a contradicting way,*** of the thermal gradient leading to the decrease of the range of the transition *** simulations agree reasonably well with experiment results.