Al-Mg-Si合金中针棒状析出相时效析出动力学及强化模拟研究*
收稿日期: 2015-10-27
网络出版日期: 2016-08-25
基金资助
* 国家重点基础研究发展计划项目2011CB70680, 国家自然科学基金项目51374137和51171089及国家科技重大专项项目2012ZX04012-011资助
MODELLING INVESTIGATION OF PRECIPITATION KINETICS AND STRENGTHENING FOR NEEDLE/ROD-SHAPED PRECIPITATES INAl-Mg-Si ALLOYS
Received date: 2015-10-27
Online published: 2016-08-25
Supported by
Supported by National Basic Research Program of China (No.2011CB706801, National Natural Science Foundation of China (Nos.51374137 and 51171089) and National Science and Technology Major Projects (No.2012ZX04012-011)
通过与计算相图数据库相耦, 建立了Al-Mg-Si三元合金体系中针棒状析出相时效析出动力学和时效强化模, 考虑了析出相形貌对形核、生长、粗化以及强化效果的影响. 通过该模型可以获得不同时效工艺下析出相微观组织特征参数的变化及对应的屈服强度变化. 利用该模型模拟了Al-Mg-Si合金在不同时效工艺条件下的时效析出过程和屈服强度变, 并与实验结果及Lifshitz-Slyozov-Wanger粗化模型计算结果进行了对比. 基于模型研究并分析了析出相长径比、界面能、合金元素含量以及析出相成分对Al-Mg-Si合金时效析出动力学和强化效果的影响. 结果表明: 不同的界面能和长径比会影响形核密度和析出相尺, 进而影响合金的屈服强度. 增加基体中Mg含量可以促进时效析, 提高合金屈服强, 而基体中Si含量的增加对合金屈服强度并不产生明显影响.
关键词： Al-Mg-Si合金; 析出动力学; 屈服强度; 针棒状析出相; 时效
陈瑞 , 许庆彦 , 柳百成 . Al-Mg-Si合金中针棒状析出相时效析出动力学及强化模拟研究*[J]. 金属学报, 2016 , 52(8) : 987 -999 . DOI: 10.11900/0412.1961.2015.00549
The aging hardening is the main strengthening mechanism of Al-Mg-Si alloy, and the hardening effect is determined by the microstructural features of precipitates including the morpholog, compositio, volume factio, nucleation density as well as the size distribution. In present wor, an integrated mathematical model coupling with the CALPHAD software is developed to simulate the precipitation kinetics and strengthening effects of needle/rod-shaped precipitates in ternary Al-Mg-Si aluminum alloys. This model takes into account the effects of morphology on the nucleatio, growth and coarsening of precipitates and on the strengthening effects. The yield strength model accounts for the whole precipitate size distributio, shape of precipitates and their specific spatial distribution based on the consideration of the competing shearing and bypassing strengthening mechanisms. Appli cation of the model to various aging treatments of Al-Mg-Si alloys is conducted and the predictions both for microstructural features and yield strength are validated with experimental results and the predictions by LSW model. Using this mode, the effects of aspect rati, interfacial energ, alloy composition and Mg/Si atom ratio in precipitates on precipitation kinetics and yield strength are investigated and analyzed. The results reveal that the different interfacial energy and aspect ratio will affect the predicted density and size of precipitat, and further have an influence on the prediction precision of yield strength. An increase of Mg content in the matrix of Al-Mg-Si alloy will accelerate the precipitation and improve the yield strengt, while increasing the Si content in the matrix will produce little influence on the yield strength.
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