Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys  

作　　者：李永胜 陈铮 卢艳丽 徐国栋 

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

出　　处：《Chinese Physics B》2007年第3期854-861,共8页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant No 50071046） and the National High Technology and Development Program of China （Grant No 2002AA331050）, and the Doctorate Foundation of Northwestern Polytechnical University of China （Grant No CX200507）.

摘　　要：The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x （3 ≤ x ≤ 10, at.%） alloys are studied using the microscopic phase-field dynamic model. The microelaso ticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size （ADS） of L12 and D022 deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x （3 ≤ x ≤ 10, at.%） alloys are studied using the microscopic phase-field dynamic model. The microelaso ticity field is incorporated into the diffusion dynamic model. The results show the morphology and coarsening dynamics being greatly changed by the elastic interactions among different precipitates, the particles aligning along the dominant directions, the average domain size （ADS） of L12 and D022 deviating from the exponent of temporal power-law, and the growth slowing down due to the increasing of elastic interactions. The dynamic scaling regime of late-stage coarsening of the precipitates is attained. Thus the scaling behaviour of structure function is also applicable for elastic interaction systems. It is also found that the variations of ADS and scaling function depend on the volume fraction of precipitates.

关 键 词：phase separation dynamic scaling elastic interaction microscopic phase-field simulation 

分 类 号：TG171[金属学及工艺—金属表面处理] TG13[金属学及工艺—金属学]