| Simulation of the coarsening behavior of intermetallic precipitates in Ni75AlxV25-x alloys |
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| 作者姓名： | LI Yongsheng CHEN Zheng WANG Yongxin LU Yanli ZHANG Jianjun |
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| 作者单位： | State Key Laboratory of Solidification Processing, Northwestem Polytechnical University, Xi＇an 710072, China |
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| 基金项目： | 国家自然科学基金;国家高技术研究发展计划(863计划);西北工业大学校科研和教改项目 |
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| 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.
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| 关 键 词： | Ni75AlxV25-x合金 金属间化合沉淀 相位变化 三重系统 |
| 收稿时间： | 3 July 2006 |
| 修稿时间： | 2006-07-03 |
Simulation of the coarsening behavior of intermetallic precipitates in Ni75AlxV25-x alloys |
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| LI Yongsheng CHEN Zheng WANG Yongxin LU Yanli ZHANG Jianjun.Simulation of the coarsening behavior of intermetallic precipitates in Ni75AlxV25-x alloys[J].Rare Metals,2007,26(5):498-503. |
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| Authors: | LI Yongsheng CHEN Zheng WANG Yongxin LU Yanli ZHANG Jianjun |
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| Affiliation: | 1. National Engineering Research Center of Light Alloy Net Forming and State Key Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, 200030 Shanghai, PR China;2. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, 710072 Xi’an, PR China;3. School of Material Science and Engineering, Shanghai University, 200444 Shanghai, PR China |
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| Abstract: | The coarsening behavior of LI2 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. |
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| Keywords: | ternary system phase transformation coarsening dynamics microscopic phase-field Ni75AlxV25-x |
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