The multi-scale Si-containing phases-assisted improvement in the microstructure and mechanical properties of Al–Mg-xSi-Cu-Zn alloys
The multi-scale Si-containing phases-assisted improvement in the microstructure and mechanical properties of Al–Mg-xSi-Cu-Zn alloys
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DOI：
10.1016/j.msea.2021.142013
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发表时间：
2021-10
期刊：
影响因子：
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通讯作者：
Liang Zhu;M. Guo;Ji-shan Zhang
中科院分区：
文献类型：
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作者：
Liang Zhu;M. Guo;Ji-shan Zhang
Al-Mg-Si合金在汽车工业中的广泛应用需要良好的成形性、高强度和高烘烤硬化响应。在此，本研究提出了一种通过设计的多尺度含硅相来提高 Al-Mg-xSi-Cu-Zn 合金综合机械性能的策略。结果表明，随着Si含量从0.55wt%增加到1.08wt%，不仅均匀处理过程中β-Al5FeSi向α-Al12(Fe,Mn)3Si的转变率提高，而且多尺度含Si相(即β-Al5FeSi、α-Al12(Fe,Mn)3Si、Mg2Si、Q和Si相)的数密度和均匀化分布水平也得到提高。可以通过优化的热机械加工路线来改善。这些改进进一步导致细晶粒微观结构和增强的平均 r、伸长率和强度。随着多尺度颗粒的类型、形态、数密度和分布的变化，其积极效果也发生很大变化。本文讨论了形成多尺度颗粒和高成形性的相关机制。
The wide application of Al–Mg–Si alloys in automobile industry requires good formability, high strength and high bake-hardening response. Herein, this study presents a strategy to improve the comprehensive mechanical properties of Al–Mg-xSi-Cu-Zn alloys assisted by the designed multi-scale Si-containing phases. The results show that with increasing Si content from 0.55 to 1.08 wt%, not only the transformation rate of β-Al5FeSi to α-Al12(Fe,Mn)3Si during the homogeneous treatment can be increased, but also the number density and homogenization distribution level of the multi-scale Si-containing phases (i.e., β-Al5FeSi, α-Al12(Fe,Mn)3Si, Mg2Si, Q and Si phases) can be improved by the optimized thermomechanical processing route. These improvements further result in the fine-grained microstructure and enhanced average r, elongation and strengths. The positive effects change greatly with the changes of type, morphology, number density and distribution of the multi-scale particles. The related mechanisms of forming multi-scale particles and high formability have been discussed in this paper.