Phase-field study on competition precipitation process of Ni-Al-V alloy

作     者：卢艳丽 卢广明 贾德伟 陈铮 Yan-li LU;Guang-ming LU;De-wei JIA;Zheng CHEN

作者机构：西北工业大学凝固技术国家重点实验室西安710072 

出 版 物：《Transactions of Nonferrous Metals Society of China》 (中国有色金属学报（英文版）)

年 卷 期：2015年第25卷第2期

页      面：544-551页

核心收录：

学科分类：0806[工学-冶金工程] 08[工学] 0818[工学-地质资源与地质工程] 0815[工学-水利工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0813[工学-建筑学] 0814[工学-土木工程] 0702[理学-物理学] 

基　　金：Projects(51174168,51274167)supported by the National Natural Science Foundation of China Project(2014JM7261)supported by the Natural Science Basic Research Plan in Shaanxi Province of China Project(B08040)supported by "111" Project,China 

主　　题：Ni-Al-V alloy microstructure evolution precipitation process phase-field method 

摘      要：With microscopic phase-field kinetic model, atomic-scale computer simulation program for the precipitation sequence and microstructure evolution of the ordered intermetallic compound γ＇ and θ in ternary Ni75AlxV25-x alloy were studied. The simulation results show that Al concentration has important effects on the precipitation sequence. When Al concentration in Ni75AlxV25-x alloy is low, 0（Ni3V） ordered phase will be firstly precipitated, followed by γ＇（Ni3Al） ordered phase. With Al concentration increasing, θ and γ＇ ordered phases are simultaneously precipitated. With A1 concentration further increasing, γ＇ ordered phase is firstly precipitated, followed by θ ordered phase. There is a competition relationship between θ and γ＇ ordered phases during growth and coarsening process. No matter which first precipitates, θ ordered phase always occupies advantage in the competition process of coarsening, thus, the microstructure with preferred orientation is formed.