| Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys |
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| 作者姓名： | 李永胜 陈铮 卢艳丽 徐国栋 |
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| 作者单位： | State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi'an 710072, China;State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi'an 710072, China;State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi'an 710072, China;State Key Laboratory of Solidification Processing,
Northwestern Polytechnical University, Xi'an 710072, China |
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| 基金项目： | 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 ≤ 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.
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| 关 键 词： | Ni75AlxV25-x合金 相分离 动态氧化起皮行为 腐蚀行为 相场模型 |
| 收稿时间： | 4/8/2006 12:00:00 AM |
| 修稿时间： | 2006-04-082006-09-20 |
Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys |
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| Li Yong-Sheng,Chen Zheng,Lu Yan-Li and Xu Guo-Dong.Dynamic scaling behaviour of late-stage phase separation in Ni75AlxV25-x alloys[J].Chinese Physics B,2007,16(3):854-861. |
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| Authors: | Li Yong-Sheng Chen Zheng Lu Yan-Li and Xu Guo-Dong |
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| Institution: | [1]State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an 710072, China |
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| Abstract: | The dynamic scaling behaviour of late-stage phase separation and
coarsening mechanisms of L12 and D022 in
Ni75AlxV25-x (3 \le x \le 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. |
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| Keywords: | phase separation dynamic scaling elastic interaction microscopic phase-field simulation |
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