Effect of Diffusivity on the Pseudospinodal Decomposition of the γ' Phase in a Ni-Al Alloy

被引:8
作者
Li, Yongsheng [1 ]
Pang, Yuxuan [1 ]
Liu, Wei [1 ]
Wu, Xingchao [1 ]
Hou, Zhiyuan [1 ]
机构
[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Jiangsu, Peoples R China
基金
中国国家自然科学基金;
关键词
composition profiles; intermetallics; kinetics; phase field modeling; pseudospinodal; FIELD MODEL; MICROSTRUCTURE; SIMULATION; PRECIPITATION; EVOLUTION; ENERGY; SINGLE; NI3AL; PURE;
D O I
10.1007/s11669-016-0450-6
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effect of diffusivity on pseudospinodal decomposition of gamma' (Ni3Al) phase precipitation was investigated in a Ni-Al alloy using the diffuse interface phase field model. The gamma' phase microstructure, coarsening dynamics and interfacial composition width between the gamma and gamma' phases were studied as a function of the diffusivity magnitude. Increasing the diffusivity results in a reduced number of gamma' nuclei, and accelerated growth and coarsening of the gamma' phase. The cube of the gamma' average radius versus time shows a linear relation during coarsening, and the Al concentration in the gamma matrix follow the relations regardless of the diffusivity magnitude. The gamma/gamma' interfacial composition width decreases with increased diffusivity and average radius. An obvious Al concentration depleted region is present at the gamma/gamma' interface during the nucleation and growth stage of gamma' phase indicates that growth occurs by down-hill diffusion in the matrix gamma phase. That combined with the gradual increase in gamma' composition demonstrates that pseudospinodal decomposition is the transformation mechanism.
引用
收藏
页码:261 / 268
页数:8
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