(1. 重慶交通大學(xué) 機(jī)電與汽車(chē)工程學(xué)院, 重慶 400074;
2. 山東大學(xué) 材料科學(xué)與工程學(xué)院, 濟(jì)南 250061)
摘 要: 采用作者提出的Monte Carlo Potts新模型， 模擬研究了高純鋁在各向異性晶界能和晶界遷移率條件下晶粒長(zhǎng)大的組織、動(dòng)力學(xué)和晶粒尺寸分布特征， 揭示初始組織織構(gòu)強(qiáng)度對(duì)異常晶粒長(zhǎng)大的影響規(guī)律。 結(jié)果表明： 各向異性晶界能和晶界遷移率使晶粒尺寸不均勻、 形狀不規(guī)則， 降低了晶粒長(zhǎng)大指數(shù)，晶粒尺寸分布偏離對(duì)數(shù)正態(tài)分布； 異常晶粒長(zhǎng)大只出現(xiàn)在中等強(qiáng)度的織構(gòu)組織中， 而不會(huì)在太強(qiáng)或太弱織構(gòu)組織中出現(xiàn)。 理論分析認(rèn)為各向異性晶界能和晶界遷移率是異常晶粒長(zhǎng)大的內(nèi)因，織構(gòu)是引起異常晶粒長(zhǎng)大的外因， 其強(qiáng)度決定了異常晶粒長(zhǎng)大是否出現(xiàn)。
關(guān)鍵字: 異常晶粒； Monte Carlo； 模擬； 織構(gòu)
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
