失稳分解组织演化和粗化动力学的晶体相场法研究(英文)  

Phase Field Crystal Study on the Temporal Evolution and Coarsening Mechanism of Precipitates during Spinodal Decomposition

作　　者：杨涛[1] 陈铮[1] 张静[1] 董卫平[1] 伍林[1] 

机构地区：[1]西北工业大学凝固技术国家重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2013年第9期1773-1778,共6页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China(51075335,10902086 and 51174168);Northwestern Polytechnical University Foundation for Fundamental Research(NPU-FFR-JC201005);the Graduate Starting Seed Fund of Northwestern Polytechnical University(2012042)

摘　　要：以二元对称与非对称合金的调幅分解为研究对象,采用晶体相场模型从沉淀相演化和粗化机制两方面分析合金的失稳分解。研究表明,当合金的成分由对称点向非对称点转变时,沉淀相形貌逐渐由长条形过渡为球形;后期粗化机制由邻近颗粒的合并机制转变为Ostwald熟化机制;只有当二元合金的成分接近于失稳线时,其粗化动力学才较好地与修正的LSW理论符合。The spinodal decomposition of symmetric and asymmetric binary alloys has been studied from precipitate evolution and coarsening mechanism by a binary phase field crystal method. The calculated results indicate that when the alloy composition changes from a symmetric point to the asymmetric one, the morphology of decomposed phases transforms gradually from long stripes to spheres, with the coarsening mechanism undergoing a transition from the coalescence of neighboring particles to Ostwald ripening. Only the coarsening kinetics of the binary alloys which is close to the spinodal decomposition line is in a fair agreement with the prediction of the modified LSW theory.

关 键 词：晶体相场模型 失稳分解 粗化机制 二元合金 

分 类 号：O73[理学—晶体学]