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

• Published in: Transactions of Nonferrous Metals Society of China Vol. 20; no. 5; pp. 863 - 869
• Main Author: 侯延辉 谷艳霞 刘志义 李云涛 陈旭
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.05.2010; Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China; School of Materials Science and Engineering, Central South University, Changsha 410083, China; Key Laboratory for Ferrous Metallurgy and Resources Utilization of Education, Wuhan University of Science and Technology, Wuhan 430081, China%Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education, Central South University, Changsha 410083, China
• Subjects: ageing; Alloys; Aluminum base alloys; Evolution; Mathematical models; Microstructure; modeling; Precipitates; Precipitation; Strengthening; thermodynamics; 全过程; 合金强化; 析出动力学; 老龄化; 质量比; 银合金; thermodynamics; precipitation; ageing; strengthening; modeling; microstructure
• ISSN: 1003-6326
• DOI: 10.1016/S1003-6326(09)60227-2

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.