(1. 重庆交通大学 机电与汽车工程学院, 重庆 400074;
2. 山东大学 材料科学与工程学院, 济南 250061)
摘 要: 采用作者提出的Monte Carlo Potts新模型， 模拟研究了高纯铝在各向异性晶界能和晶界迁移率条件下晶粒长大的组织、动力学和晶粒尺寸分布特征， 揭示初始组织织构强度对异常晶粒长大的影响规律。 结果表明： 各向异性晶界能和晶界迁移率使晶粒尺寸不均匀、 形状不规则， 降低了晶粒长大指数，晶粒尺寸分布偏离对数正态分布； 异常晶粒长大只出现在中等强度的织构组织中， 而不会在太强或太弱织构组织中出现。 理论分析认为各向异性晶界能和晶界迁移率是异常晶粒长大的内因，织构是引起异常晶粒长大的外因， 其强度决定了异常晶粒长大是否出现。
关键字: 异常晶粒； Monte Carlo； 模拟； 织构
Monte Carlo
（1. School of Machine and Electronic,
Chongqing Jiaotong University, Chongqing 400074, China;
2. School of Materials Science and Engineering, Shandong University,
Ji'nan 250061, China）
Abstract: Some grain growth behaviors of hign-pure Al, such as microstructure, kinetics, grain size distribution, etc were investigated on condition of anisotropic grain boundary energy and mobility, and the effect law of texture in microstructure on abnormal grain growth was revealed by a Modified Monte Carlo Potts model. The results show that the anisotropy of grain boundary energy and mobility induce grain size inhomogeneous, grain shape irregular, grain growth exponent decreasing, grain size distribution deviating from log-normal distribution. Abnormal grain growth occurs only in the microstructure with middle class intensity texture, but not in the microstructure with too high class or too low class intensity texture. Theoretical analysis shows that the anisotropic grain boundary energy and mobility are intrinsic factors that cause abnormal grain growth, and the texture is external factor whose intensity determines whether the abnormal grain growth appears.
Key words: abnormal grain; Monte Carlo; simulation; texture
