A phase field study for influence of elastic energy on L1_0→L1_2 transient ordering in Ni_(75)Al_(17)Zn_8

作     者：ZHAO Yan CHEN Zheng WANG YongXin ZHANG MingYi ZHANG Jing 

作者机构：Department of Materials Science and Engineering Northwestern Polytechnical University Xi'an 710072 China State Key Laboratory of Solidification Processing Northwestern Polytechnical University Xi'an 710072 China 

出 版 物：《Chinese Science Bulletin》 (科学通报(英文版))

年 卷 期：2010年第55卷第26期

页      面：3044-3050页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 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] 0702[理学-物理学] 

基　　金：supported by the National Natural Science Foundation of China (50671084 and 50875217) 

主　　题：原子排列 弹性能 能量 2型 瞬态 短程有序 长程有序 平面投影 

摘      要：The influence of the elastic energy on L10→L12 transient ordering transformation was investigated by microscopic phase field method. It is found that there are three stages experienced in atomic ordering: solute clustering+L10 short range ordering → L10 long range ordering → L12 long range ordering. Before the formation of the high ordered L12 phase, it has firstly taken place the transformation from matrix to L10 phase, and then held the L10→L12 secondary transformation. Elastic energy is proved to take little effect on the stage of short range ordering, but as the elastic energy is multiplied, it obviously shortened the course of the solute clustering, and speeded up the proceeding of the L10 long range ordering transition. Accordingly, the increased elastic energy also strengthens the single crystalline directionality of L10 phase projecting on 2D plane and makes the ordered degree of Al and Zn atoms enhanced. With the temperature elevation, Al s and Zn s ordered degree decreased in L10 phase.