共格沉淀析出过程的微观结构演化相场法模拟

Phase-Field Model Simulation for the Microstructure Evolution of Coherent Precipitates

采用微观相场模型,对共格沉淀析出过程微观结构的演化进行计算机模拟,并探讨不同作用程度的弹性应变能对沉淀相形貌的影响规律。研究发现:当共格弹性应变能为零时,沉淀相为球状弥散分布的颗粒或"海绵状"结构,呈各向同性特征;随应变能作用的增强,沉淀相分布的取向性越来越明显,趋于沿弹性"软"方向分布,形成类方格阵、纵横层状结构等,呈各向异性特征。模拟结果和相关实验结果一致。

The microstructure evolution of coherent precipitates was simulated with the phase-field model by computer and the influence of different strain energy on the precipitation morphology was also discussed. Results show that when the coherent strain energy is 0, spherical-shaped precipitates or flocculent structure distribute randomly with isotropic morphology. With the elastic strain energy increasing, the arrangement orientation increases, quasi-periodical macro lattice structures and sandwich-shaped structures are formed with anisotropic morphology. The simulation results are in good agreement with the experimental.