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孙远洋,赵宇宏,侯华,郑晓娟,郭慧俊.时效工艺对Ni75Al15Ti10合金沉淀过程的微观相场模拟[J].稀有金属材料与工程(英文),2018,47(10):3000~3007.[Sun Yuanyang,Zhao Yuhong,Hou Hua,Zheng Xiaojuan and Guo Huijun.Microscopic phase-field Simulation for the influence of aging process on the precipitation process of Ni75Al15Ti10 alloy[J].Rare Metal Materials and Engineering,2018,47(10):3000~3007.]
Microscopic phase-field Simulation for the influence of aging process on the precipitation process of Ni75Al15Ti10 alloy
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Received:March 10, 2017  Revised:July 31, 2018
DOI:
Key words: aging temperature  dual aging  microscopic phase-field  microstructure  occupation probability
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Sun Yuanyang,Zhao Yuhong,Hou Hua,Zheng Xiaojuan and Guo Huijun  
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Abstract:
      The precipitation process of Ni75Al15Ti10 alloy was simulated by microscopic phase-field kinetics model. The microscopic morphology evolution is firstly studied, which indicates that the precipitation process has been divided into two stages: the first is the transformation from L10 phase to L12 phase, the second is the formation of stoichiometric L12 phase. The effect of single aging temperature on the microstructure and atomic occupation probability and atomic diffusion are subsequently investigated. The result shows that the shape of γ′ precipitates is transformed from irregular shape to regular cuboid and the degree of orientation growth enhances with the increasing of aging temperature. But the higher aging temperature, the lower occupation probability and lower order degree. Meanwhile, the path of diffusion of Al is from the interface to the internal of γ" phase, and the diffusion of Ti atom is the opposite. Furthermore, we further study the dual aging with the purpose of improving occupation probability of γ′ precipitates and discuss its influence on the γ′ phase. Dual aging can not only obtain stable γ" phase with regular shape, but also can increase the occupation probability of Al and Ti and inhibit the formation of anti-site defects. Our results provide useful information in preparing Ni-Al-Ti alloy with excellent mechanical properties to some extent.