Modeling of whole process of ageing precipitation and strengthening inAl-Cu-Mg-Ag alloys with high Cu-to-Mg mass ratio

来源期刊：中国有色金属学报(英文版)2010年第5期

论文作者：侯延辉 谷艳霞 刘志义 李云涛 陈旭

文章页码：863 - 869

Key words：ageing; precipitation; modeling; microstructure; thermodynamics; strengthening

Abstract: A physically based numerical model to predict the microstructure evolution and yield strength of high Cu-to-Mg mass ratio Al-Cu-Mg-Ag alloys during the whole ageing process was developed. A thermodynamically-based precipitation model, employing the classical nucleation and growth theories, was adapted to deal with the precipitation kinetics (evolution of radius and volume fraction of precipitates for Ω phase) of aged Al-Cu-Mg-Ag alloys. The model gives an estimation of the precipitation kinetics (evolution of radius and density of precipitates for both θ′ and Ω phases) of the alloy. The strengthening model based on Orowan mechanism was deduced. The microstructural development and strength predictions of the model are generally in good agreement with the experimental data.

基金信息：supported by the National Basic Research Program of China
supported by Central South University and Ministry of Education of China for the Domestic Exchange PhD student