Simulation of the coarsening behavior of intermetallic precipitates in Ni_(75)Al_xV_(25-x) alloys  

作　　者：LI Yongsheng CHEN Zheng WANG Yongxin LU Yanli ZHANG Jianjun 

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

出　　处：《Rare Metals》2007年第5期498-503,共6页稀有金属（英文版）

基　　金：the National Natural Science Foundation of China (No. 50071046);the Hi-tech Research and Development Program of China (No. 2002AA331050);the Doctorate Foundation of Northwestern Poly-technical University (No. CX200507).

摘　　要：The coarsening behavior of L12 and D022 in Ni75AlxV25-x （x,at.%） alloys including coherent strain was investigated using the microscopic phase-field model. The simulation results indicate that the shape transition and spatial correlation of L12 and D022 are caused by the morphological-dependent anisotropic elastic interactions in the system. The coarsening process of the particles is by means of neighbor particles impingement and aggregation into larger ones. For the strain-induced interactions between the precipitates,the LSW theory is altered for the coarsening behavior of L12 and D022. In addition,the simulation reveals that the growth and coarsening of D022 present two obvious stages at lower Al concentration regions and proceed simultaneously at high Al concentration regions. The growth and coarsening processes of L12 at the same regions is reverse to those of D022.The coarsening behavior of L12 and D022 in Ni75AlxV25-x （x,at.%） alloys including coherent strain was investigated using the microscopic phase-field model. The simulation results indicate that the shape transition and spatial correlation of L12 and D022 are caused by the morphological-dependent anisotropic elastic interactions in the system. The coarsening process of the particles is by means of neighbor particles impingement and aggregation into larger ones. For the strain-induced interactions between the precipitates,the LSW theory is altered for the coarsening behavior of L12 and D022. In addition,the simulation reveals that the growth and coarsening of D022 present two obvious stages at lower Al concentration regions and proceed simultaneously at high Al concentration regions. The growth and coarsening processes of L12 at the same regions is reverse to those of D022.

关 键 词：ternary system phase transformation coarsening dynamics microscopic phase-field Ni75AlxV25-x 

分 类 号：TG14[一般工业技术—材料科学与工程]