晶粒长大的影响
(1. 广西大学 物理科学与工程技术学院，南宁 530004；
2. 中国科学院 国际材料物理中心，沈阳 150016)
摘 要: 采用相场法研究多个空间取向的棒状第二相粒子以及圆形第二相粒子对基体晶粒长大的影响。结果表明：在晶粒长大过程中，绝大部分棒状第二相粒子位于晶界处并与晶界方向一致，圆形第二相粒子大多位于三晶交点处；第二相粒子表现出强烈的钉扎晶界的作用，极限晶粒半径可以用Zener关系表示；在第二相粒子面积分数和粒子尺寸相同的情况下，当第二相粒子面积分数较小(＜5%)时，棒状与圆形第二相粒子对晶粒长大的钉扎作用没有明显差别；当粒子面积分数较大(＞5%)时，棒状第二相的钉扎效果好于圆形第二相的钉扎效果。
关键字: 相场法；晶粒长大；第二相粒子；Zener钉扎
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
