Yuhong ZHAO
,
Hua HOU
,
Hong XU
,
Yongxin WANG
,
Zheng CHEN
,
Xiaodong SUN
材料科学技术（英文）
The atomic scale computer simulation for initial precipitation mechanism of Ni75Al6V19 alloy was carried out for the first time by employing the microscopic diffusion equation. The initial precipitation process was investigated through simulating the atomic pictures and calculating the order parameters of the two kinds of ordered phases. Simulation results show that the ordered phase precipitated earlier than θ ordered phase by congruent ordering+spinodal decomposition mechanism and thus produced a nonstoicheometric single ordered phase. Then, the nonstoichiometricθphase precipitated by a non-classical nucleation and growth mechanism at the APBS of phase.
关键词:
Precipitation mechanism
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Yongsheng LI
,
Zheng CHEN
材料科学技术（英文）
The interrupted aging mechanisms were applied to Ni75Al2.9V22.1 alloy by using the microscopic phase-field simulation method. For the single phase region existing at high temperature, the low content alloy was used as the study object. With the progressive aging mechanisms, the metastable phase γ' of high temperature can be obtained from the low temperature two phase regions, and the quantity of γ' phase reduces with increasing temperature. The θ single phase morphology at high temperature regions will turn to be the γ'+θ two phase morphology at low temperature with the interrupted aging method. Despite of the different precipitation paths of γ' phase, the precipitation mechanisms are the same for the low temperature aging and high temperature interrupted aging.
关键词:
Microstructure
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