多元合金多晶粒的枝晶生长非等温相场模拟

Phase-Field Model of Non-Isothermal Dendritic Growth of Multicomponent Alloy with Multiple Grains

基于多元合金多晶粒生长的等温相场模型,耦合温度场,发展一个新的非等温枝晶生长相场模型。利用该模型,以Al-Cu-Mg三元合金为例,模拟多元合金凝固过程中多个晶粒枝晶生长过程。结果表明,该型计算结果展现了多个晶粒枝晶的竞争生长,能较真实再现凝固过程中的枝晶生长过程;展示凝固潜热的释放;在枝晶中,先凝固部分温度要低于后凝固部分;过冷度越大,凝固速度越快。

A new phase-field model of dendritic growth of non-isothermal solidification is developed based on the phase-field model of isothermal solidification of multicomponent alloy with multiple grains, in connection with the temperature field. Taking AI-Cu-Mg alloy for example, the dendritic growth process of multiple grains during multicomponent alloy solidification was simulated. The simulation results show dendritic competitive growth of multiple grains, and reproduced the process of dendrite growth in practical solidification. The release of latent heat during the solidification of the alloy was present in simulation. In the same grain, the temperature of the region solidified earlier is less than the region of later solidified. The higher the undercooling degree, the quicker the solidification rate is.