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讨论了当前固态组织演变过程的相场法模拟模型,论证了相场法中界面的概念以及模型中界面的各种处理方法,以AZ31镁合金再结晶系统为例,研究了模型参数取值对界面特征的影响,提出了晶界作用域的概念,阐述了晶界作用域就是相场模型中界面处有序化变量的变化范围,其物理意义是界面能量的分布范围,并对应于成分界面偏析的范围.模拟得出,晶界作用域宽度主要由梯度项系数决定,晶界能则由梯度项系数和耦合项系数共同决定.对于AZ31镁合金,模拟研究了晶界作用域宽度取值的合理性和对显微组织影响的关系,得出取值为1.18μm时,模拟符合实验结果.引入界面作用域的新概念后,利用本模型首次实现了相场法晶粒长大的真实空间、时间的工业尺度的模拟.
The phase field simulation model of the evolution of solid state microstructures was discussed. The concept of interface in phase field method and various processing methods of interface in the model were demonstrated. Taking AZ31 magnesium alloy recrystallization system as an example, The concept of grain boundary scope is put forward. The scope of grain boundary is the range of variation of ordering variables in the interface of phase field model. Its physical meaning is the distribution range of interface energy and corresponds to the component interface The range of segregation.The simulation results show that the width of the grain boundary is mainly determined by the gradient coefficient and the grain boundary energy is determined by the gradient coefficient and the coupling coefficient.For the AZ31 magnesium alloy, And the effect on the microstructure, the simulation results agree with the experimental results when the value is 1.18μm.After introducing the new concept of the interface scope, using the model for the first time to achieve the real phase growth grain Space, time industrial scale simulation.