Mg和Cu在Al-Zn-Mg合金时效初期的Monte Carlo模拟  

Monte Carlo simulation of effect of Mg and Cu on precipitation of Al-Zn-Mg alloys during initial ageing stage

作　　者：林柳秋[1] 荣莉[1] 王为[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100124

出　　处：《中国有色金属学报》2012年第2期453-459,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家重点基础研究发展计划资助项目(2007CB613706);北京工业大学博士科研启动基金资助项目(52009999200702)

摘　　要：采用Monte Carlo方法模拟研究Al-6Zn-(2Mg)和Al-10Zn-1.9Mg-(1.7Cu)合金时效初期微观结构的演变过程,并分析Mg和Cu的基本作用。结果表明:时效初期,Al-6Zn合金中的Zn原子有较强的团聚倾向,形成了明显的Zn原子簇;而在Al-6Zn-2Mg合金中出现明显的Zn原子簇、Zn-Mg原子簇及少量的Mg原子簇。Mg的作用是通过Mg和Zn原子间强烈的相互作用形成Zn、Mg原子交替排布的短程有序结构。含铜的Al-10Zn-1.9Mg-1.7Cu合金中,不仅形成了Zn原子簇、Mg原子簇和Zn-Mg原子簇,还形成了少量Zn-Cu原子簇、Mg-Cu原子簇和Zn-Mg-Cu原子簇。Cu的存在促进Zn原子和Zn-Mg原子团簇化,但对Mg原子的团簇化影响不大。The Monte Carlo method was applied to simulate the microstructural evolution of Al-6Zn-（2Mg） and Al-10Zn-1.9Mg-（1.7Cu） alloys during the initial ageing stage,and the effect of Mg and Cu was analyzed.The simulation results show that there are Zn clusters in Al-6Zn alloy during the initial ageing stage.while in Al-6Zn-2Mg alloy,there are distinct Zn clusters,Zn-Mg clusters and a spot of Mg clusters in the atom configurations.The effect of Mg is forming Zn-Mg short range order structure by strong interaction of Mg and Zn atom.In Al-10Zn-1.9Mg-1.7Cu alloy,there are distinct Zn clusters,Zn-Mg clusters and Mg clusters in the atom configurations.Furthermore,there are seldom Zn-Cu clusters,Mg-Cu clusters and Zn-Mg-Cu clusters.The presence of Cu stimulates the clustering of Zn and Zn-Mg,while has no significant influence on the clustering of Mg atom.

关 键 词：AL-ZN-MG合金 MONTE CARLO方法 时效初期 

分 类 号：TG146.2[一般工业技术—材料科学与工程]