Entropy as a selection rule for crystal growth in undercooled binary eutectic melts

作     者：LU YiPing XI ZengZhe YANG GenCang LIN Xin ZHOU YaoHe 

作者机构：State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China School of Materials and Chemical Engineering Xi'an Technological University Xi'an 710032 China 

出 版 物：《Chinese Science Bulletin》 (CHINESE SCIENCE BULLETIN)

年 卷 期：2009年第54卷第6期

页      面：1012-1018页

核心收录：

学科分类：13[艺术学] 07[理学] 070205[理学-凝聚态物理] 08[工学] 1305[艺术学-设计学（可授艺术学、工学学位）] 081104[工学-模式识别与智能系统] 080501[工学-材料物理与化学] 0804[工学-仪器科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 0703[理学-化学] 081101[工学-控制理论与控制工程] 0811[工学-控制科学与工程] 0702[理学-物理学] 

基　　金：Supported by the National Natural Science Foundation of China (Grant No. 50395103) Doctorate Foundation of Northwestern Polytechnical University (Grant No. CX200506) 

主　　题：熵模型 共晶相 二元 晶体生长 选择规则 熔体 相互作用参数 正规溶液模型 

摘      要：A solution entropy model was developed for the undercooled binary eutectic alloy systems. As an ex-tension of Taylor and Fidler et al. s model, the present model considered the change of phase compo-sition with the increase of undercooling. Furthermore, the sub-regular solution model and the interac-tion parameter (IAB) were also introduced. In this paper, the extended model is used to calculate the solution entropy for binary eutectic phases under the undercooled condition, and the application scope of the model is also extended. Not only the growth manner of eutectic phases, but also the transition of morphologies may be predicted and explained by calculating the solution entropy of eutectic phases under the non-equilibrium condition with the developed model. Experimental results show that the developed model is valid for the undercooled Ni-Si and Ni-Sn eutectic alloy systems.