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
发布人：上海艾荔艾合金股份有限公司www.shailiai.cn
更新时间：2016-05-28
通过与计算相图数据库相耦合, 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型, 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.
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MODELLING INVESTIGATION OF PRECIPITATION KINETICS AND STRENGTHENING FOR NEEDLE/ROD-SHAPED PRECIPITATES IN Al-Mg-Si ALLOYS通过与计算相图数据库相耦合, 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型, 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化, 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寸, 进而影响合金屈服强度. 增加基体中 Mg 含量可以促进时效析出, 提高合金屈服强度, 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.
The aging hardening is the main strengthening mechanism of Al-Mg-Si alloys, and the hardening effect is determined by the microstructural features of precipitates including the morphology, composition, volume faction, nucleation density as well as the size distribution. In present work, 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 nucleation, growth and coarsening of precipitates and on the strengthening effects. The yield stress model accounts for the whole precipitate size distribution, shape of precipitates and their specific spatial distribution based on the consideration of the competing shearing and bypassing strengthening mechanisms. Application of the model to various aging treatments of Al-Mg-Si alloys is conducted and the predictions both for microstructural features and yield stress are validated with experimental results and the predictions by LSW model. Using this model, the effects of aspect ratio, interfacial energy, alloy composition and Mg/Si atom ratio in precipitates on precipitation kinetics and yield stress are investigated and analyzed. The results reveal that the different interfacial energy and aspect ratio will affect the predicted density and size of precipitate, and further has an influence on the prediction precision of yield stress. An increase of Mg content in the matrix of Al-Mg-Si alloy will accelerate the precipitation and improve the yield stress, while increasing the Si content in the matrix will produce little influence on the yield stress.
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