Microscopic phase-field study on order-disorder transition of the antiphase domain boundary formed between L1_2 phases  

作　　者：ZHANG MingYi YANG Kun CHEN Zhen WANG YongXin FAN XiaoLi 

机构地区：[1]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi＇an 710072, China

出　　处：《Science China(Technological Sciences)》2011年第12期3409-3414,共6页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos. 50941020, 10902086, 50875217,and 20903075);the Natural Science Foundation of Shaanxi Province (Grant Nos.SJ08-ZT05 and SJ08-B14);the Doctorate Foundation of Northwest Polytechnical University (Grant No.CX200905)

摘　　要：Kinetics of order-disorder transition at antiphase domain boundary （APDB） formed between L12 （Ni3A1） phases is investigated using microscopic phase-field model. The results demonstrate that whether order-disorder transition happens or not depends on the atomic structure of the APDB. Accompanied with the enrichment of V and depletion of Ni and A1, the ordered APDB with phase-shift vector of a/2[100] transforms into a thin disordered phase layer. Whereas at the APDB with phase shift vector of a/2[110], which remains ordered with temporal evolution, Ni and A1 enrich and V depletes. Composition evolution of APDB with order-disorder transition favors the nucleation of DO22 phase, and the formation of disordered phase layer accelerates the growth of DO22 phase. The disordered phase caused by order-disordered transition of the APDB can be considered as the transient phase along the precipitation path of DO22 phase.

关 键 词：microscopic phase-field antiphase domain boundary order-disorder transition transient phase Ni-AI-V alloy 

分 类 号：TG146.2[一般工业技术—材料科学与工程] TG146.15[金属学及工艺—金属材料]