元胞自動機(CA)模擬
(華南理工大學 材料科學與工程學院，廣州 510640)
摘 要: 采用Moore型鄰域定義的元胞自動機模型模擬研究第二相顆粒對多晶材料晶粒生長的影響。結(jié)果表明：第二相顆粒的體積分數(shù)及尺寸對基體晶粒組織特征的影響很大；第二相顆粒含量增加可以提高晶粒尺寸分布的均勻性，而顆粒尺寸增大則導致晶粒尺寸分布的均勻性降低。通過對模擬數(shù)據(jù)的回歸分析獲得極限晶粒尺寸(D)與顆粒尺寸(d)和顆粒含量(f)之間的關系；不同的顆粒尺寸(d)對應不同的擬合指數(shù)(n)。
關鍵字: 多晶材料；第二相顆粒；晶粒長大；元胞自動機
（School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China）
Abstract:The influence of second-phase particles on matrix grain growth was simulated by the cellular automata method based on the Moore type neighborhood definition. The modeling results show that the volume fraction and size of the second-phase particles have significant influence on the grain morphology. The increase of volume fraction of second-phase particles can improve the grain size uniformity, while the increase of the particle size deteriorates the uniformity of the grain size distribution. By regression analysis of the simulation data, the correlation among the parameters of limited grain size, mean particle size and particle volume fraction is obtained. Different particle sizes correspond to different fitting exponents.
Key words: poly crystalline materials; second-phase particle; grain growth; cellular automata
