晶粒長大的影響
(1. 廣西大學(xué) 物理科學(xué)與工程技術(shù)學(xué)院，南寧 530004；
2. 中國科學(xué)院 國際材料物理中心，沈陽 150016)
摘 要: 采用相場法研究多個空間取向的棒狀第二相粒子以及圓形第二相粒子對基體晶粒長大的影響。結(jié)果表明：在晶粒長大過程中，絕大部分棒狀第二相粒子位于晶界處并與晶界方向一致，圓形第二相粒子大多位于三晶交點處；第二相粒子表現(xiàn)出強烈的釘扎晶界的作用，極限晶粒半徑可以用Zener關(guān)系表示；在第二相粒子面積分數(shù)和粒子尺寸相同的情況下，當?shù)诙嗔Ｗ用娣e分數(shù)較小(＜5%)時，棒狀與圓形第二相粒子對晶粒長大的釘扎作用沒有明顯差別；當粒子面積分數(shù)較大(＞5%)時，棒狀第二相的釘扎效果好于圓形第二相的釘扎效果。
關(guān)鍵字: 相場法；晶粒長大；第二相粒子；Zener釘扎
orientations on grain growth simulated by phase field method
（1. School of Physics Science and Engineering, Guangxi University, Nanning 530004, China;
2. International Center for Materials Physics, Chinese Academy of Sciences, Shenyang 150016, China）
Abstract:The phase-field method was applied to simulating the effect of the second-phase particle with different geometric orientations and spherical second-phase particles (SPP) on the matrix grain growth. The results show that, in the grain growth process, most of the spherical SPP locate in the intersection of crystal boundary, while stick SPP locate in the grain boundary with the same direction as the grain boundaries. The SPP show a strong pinning effect on grain boundary and the limiting grain radius can be expressed by Zener relations. Under the condition that the SPP area fraction and size are constants, there is no difference between stick SPP and spherical SPP in the pinning effect on grain growth when the area fraction of the SPP is small(＜5%), however, compared to spherical SPP, the stick SPP show more effective pinning effect when the area fraction of the SPP is large(＞5%).
Key words: phase field method; grain growth; second-phase particles; Zener pinning
