Mg和Cu在Al-Zn-Mg合金时效初期的Monte Carlo模拟

来源期刊:中国有色金属学报2012年第2期

论文作者:林柳秋 荣莉 王为 聂祚仁

文章页码:453 - 459

关键词:Al-Zn-Mg合金;Monte Carlo方法;时效初期

Key words:Al-Zn-Mg alloys; Monte Carlo method; initial ageing stage

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。

Abstract:

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.

基金信息:国家重大基础研究发展计划资助项目

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