| Microscopic phase-field simulation including elastic strain energy for early precipitation process of Ni-Al alloys with medium Al content |
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| 作者姓名： | LU Yanli CHEN Zheng LI Yongsheng WANG Yongxin CHU Zhong |
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| 作者单位： | State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an 710072, China |
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| 基金项目： | 中国科学院资助项目，国家高技术研究发展计划(863计划) |
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| 摘 要： | The early precipitation process of Ni-Al alloy was studied on the atomic scale based on the microscopic phase-field kinetic model. We investigated the effect of elastic strain energy on precipitation mechanism and morphological evolution of the alloy. Simulation results show that at the early stage of precipitation, γ′ ordered phase presents non-directional and irregular shape during the process of aging, the γ′ ordered phases change into the quadrate shape and their orientations become more obvious; at the later stage, the γ′ precipitates present quadrate shape with round corner and align along the 100 ] and 010 ] directions. The mechanism of early precipitation for Ni-13at. % Al alloy is the mixed mechanism of non-classical nucleation growth and spinodal decomposition and near to non-classical nucleation growth, and the mechanism of early precipitation for Ni-15.8at. % Al alloy is the mixed mechanism of non-classical nucleation growth and spinodal decomposition and near to spinodal decomposition.
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| 关 键 词： | Ni-Al alloy early precipitation microscopic phase-field simulation elastic strain energy. |
Microscopic phase-field simulation including elastic strain energy for early precipitation process of Ni-Al alloys with medium Al content |
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| LU Yanli,CHEN Zheng,LI Yongsheng,WANG Yongxin,CHU Zhong.Microscopic phase-field simulation including elastic strain energy for early precipitation process of Ni-Al alloys with medium Al content[J].Progress in Natural Science,2005,15(12):1104-1109. |
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| Authors: | LU Yanli CHEN Zheng LI Yongsheng WANG Yongxin CHU Zhong |
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| Affiliation: | State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University,Xi'an 710072, China |
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| Abstract: | The early precipitation process of Ni-Al alloy was studied on the atomic scale based on the microscopic phase-field kinetic model. We investigated the effect of elastic strain energy on precipitation mechanism and morphological evolution of the alloy. Simulation results show that at the early stage of precipitation, γ′ ordered phase presents non-directional and irregular shape during the process of aging, the γ′ ordered phases change into the quadrate shape and their orientations become more obvious; at the later stage, the γ′ precipitates present quadrate shape with round corner and align along the 100 ] and 010 ] directions. The mechanism of early precipitation for Ni-13at. % Al alloy is the mixed mechanism of non-classical nucleation growth and spinodal decomposition and near to non-classical nucleation growth, and the mechanism of early precipitation for Ni-15.8at. % Al alloy is the mixed mechanism of non-classical nucleation growth and spinodal decomposition and near to spinodal decomposition. |
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| Keywords: | Ni-Al alloy early precipitation microscopic phase-field simulation elastic strain energy |
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