Al-Cu-Li-xMg合金时效初期微结构演变的Monte Carlo模拟  

Monte Carlo simulation of microstructural evolution of Al-Cu-Li-xMg alloys during initial ageing stage

作　　者：李世晨[1] 郑子樵[1] 刘祖耀[1] 李剑[1] 杨培勇[1] 殷顺高[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2005年第9期1376-1383,共8页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50271084)

摘　　要：采用基于Multi-States Ising Model的Monte Carlo算法,模拟研究了Al-Cu-Li-xMg合金时效初期微观结构的演变过程,结果表明:时效早期,在Al-1.2Cu-5.7Li合金中微结构的主要形态是Li原子团簇、Li-Cu原子对和空位团簇,且空位团簇的出现多出现在Li原子团簇附近,形成共生形态;而Al-1.2Cu-5.7Li-xMg合金中,出现明显的Cu-Clusters,而Li原子的偏聚过程则受到抑制,且空位团簇的形态也发生了变化,多与Cu-Mg原子团簇形成共生形态;微量Mg的作用是通过Mg/Li原子间存在强烈的相互作用调整Li原子团簇的偏聚形态,导致大量被Li原子Clustering过程锁定的Cu原子和空位被置换出来,进而影响Li、Cu原子团簇的形态和空位的分布形态,并影响随后的析出相分布形态。The Monte Carlo Method, which based on the Multi-States lsing Model, was applied to simulate the microstructural evolution of Al-Cu- Li-xMg alloys during the initial ageing stage. The simulation results show that： there are Li-clusters, Li-Cu co-clusters and vacancy-clusters in Al-Cu-Li alloy during the initial ageing stage, and Li clusters exhibit a tendency to co-existed with vacancy clusters; with small addition of Mg, Cu clusters are provoked, while the clustering of Li atoms is restrained, the vacancy clusters have a tendency to co-existed with Cu-Mg co-clusters. Small addition of Mg has strongly effect on the morphology of Li clusters, which can release Cu atoms and vacancies from the locking-state by Li clusters. Therefore, the morphology of precipitates can be affected by the addition of Mg subsequently.

关 键 词：AL-CU-LI合金 MONTE Carlo METHOD 时效初期 

分 类 号：TG146.2[一般工业技术—材料科学与工程]