Enhancing combinatorial properties, such as excellent corrosion resistance, high strength and good ductility combined, is an important issue for manufacturing high-quality AlMgSi(Cu) alloys. Here, we show that this can be achieved by optimizing a combinatorial process consisting of pre-ageing, cold-rolling and post-ageing to tailor the hierarchical microstructures of the alloy. Transmission electron microscopy analysis reveals that the enhanced combinatorial properties of corrosion resistance, strength and ductility are owing to modification of grain boundary microstructure in good association with changes of precipitate microstructures and a more homogenous distribution of solute atoms, as compared with the microstructures of the alloy processed by thermal ageing only.

中文翻译：

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机械-热组合工艺获得的AlMgSi（Cu）合金最佳组合性能

增强组合性能，例如优异的耐腐蚀性，高强度和良好的延展性，是制造高质量AlMgSi（Cu）合金的重要问题。在这里，我们表明可以通过优化组合工艺来实现这一目的，包括预时效，冷轧和后时效，以调整合金的分层微观结构。透射电子显微镜分析表明，与合金的显微组织相比，由于晶界显微组织的改变与析出的显微组织的变化以及溶质原子的分布更加均匀有关，因此提高了耐腐蚀性，强度和延展性的组合性能。仅通过热老化处理。