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采用一种改进的Potts模型Monte Carlo算法,对具有Weibull尺寸分布(参数β=3.47)的晶粒组织进行了3D正常晶粒长大过程的仿真研究.仿真结果表明:整个晶粒长大过程遵循抛物线长大规律,晶粒生长指数为0.501,非常接近理论值0.5.晶粒长大过程可分为过渡阶段与准稳态长大两个阶段.Weibull尺寸分布参数β由过渡阶段的3.47逐渐演变为准稳态阶段的2.76,准稳态阶段晶粒尺寸分布参数保持β=2.76不变.晶粒的平均面数〈f〉随仿真时间的增加而增大,在准稳态阶段后期趋近于稳定数值.晶粒面数分布为Lognormal分布,最高频率面数f为10,个体晶粒面数范围为3～43.
A modified Potts Monte Carlo algorithm was used to simulate the 3D normal grain growth process of grain structure with Weibull size distribution (parameter β = 3.47) .The simulation results show that the whole grain growth process follows Parabola growth law, the grain growth index of 0.501, very close to the theoretical value of 0.5. Grain growth process can be divided into transitional phase and quasi-steady-state growth of two stages .Weibull size distribution parameter β by the transitional phase 3.47 gradually evolved For the quasi-steady-state phase of 2.76, the parameter of the grain size distribution in the quasi-steady state remains unchanged at β = 2.76. The mean number of grains increases with the increase of simulation time and approaches the later stage of quasi-steady state For the stable values, the grain number distribution is Lognormal, the highest frequency is f, and the number of individual grains is 3 ~ 43.