中国物理B ›› 2007, Vol. 16 ›› Issue (3): 854-861.doi: 10.1088/1009-1963/16/3/050

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

李永胜, 陈铮, 卢艳丽, 徐国栋   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • 收稿日期:2006-04-08 修回日期:2006-09-20 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    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).

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

Li Yong-Sheng(李永胜)†, Chen Zheng(陈铮), Lu Yan-Li(卢艳丽), and Xu Guo-Dong(徐国栋)   

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China
  • Received:2006-04-08 Revised:2006-09-20 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    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).

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摘要： The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x ($3 \leq x \leq 10$, at.%) alloys are studied using the microscopic phase-field dynamic model. The microelasticity 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

Abstract: The dynamic scaling behaviour of late-stage phase separation and coarsening mechanisms of L12 and D022 in Ni75AlxV25-x ($3 \leq x \leq 10$, at.%) alloys are studied using the microscopic phase-field dynamic model. The microelasticity 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.

Key words: phase separation, dynamic scaling, elastic interaction, microscopic phase-field simulation

中图分类号:  (Phase equilibria)

  • 64.75.-g