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首页> 美国卫生研究院文献>Materials >Effects of the Mg/Si Ratio on Microstructure Mechanical Properties and Precipitation Behavior of Al–Mg–Si–1.0 wt -Zn Alloys
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Effects of the Mg/Si Ratio on Microstructure Mechanical Properties and Precipitation Behavior of Al–Mg–Si–1.0 wt -Zn Alloys

机译：Mg / Si比对Al–Mg–Si–1.0 wt％-Zn合金的组织力学性能和析出行为的影响

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摘要

Aluminum alloys are widely used as first-choice materials for lightweight automotive applications. It is important that an alloy have a balance between strength and formability. In this study, the alloys were melted, cast, hot rolled, and cold rolled into 1 mm-thick sheets. The microstructure, mechanical properties, and precipitation behavior of Al–Mg–Si–1.0 wt %-Zn alloys with Mg/Si ratios of 0.5, 1, and 2 after solution treatment were studied using optical and electron microscopy, a tensile test, the Vickers hardness test, and differential scanning calorimetry. The results showed that a high density and number of Al–Fe–Si particles were observed in the matrix, thus causing the formation of more homogeneous and smaller recrystallized grains after treatment with the solution. In addition, a higher volume fraction of cubeND and P-types texture components formed during solution treatment. Also, a high r value and excellent deep drawability were achieved in the medium-Mg/Si-ratio alloy. The formation of denser strengthening precipitates led to a better paint-bake hardening effect in comparison with the other two alloys. Furthermore, the precipitation kinetics were enhanced by the addition of Si, and the addition of Zn did not alter the precipitation sequence of the Al–Mg–Si alloy. The dual-phase strengthening effect was not achieved in the studied alloys during paint-bake treatment at 175 °C.
机译：铝合金被广泛用作轻型汽车应用的首选材料。合金在强度和可成型性之间取得平衡非常重要。在这项研究中，合金被熔化，铸造，热轧和冷轧成1毫米厚的薄板。使用光学和电子显微镜，拉伸试验，固溶处理，研究了固溶处理后Mg / Si比为0.5、1和2的Al–Mg–Si–1.0 wt％-Zn合金的组织，力学性能和析出行为。维氏硬度测试和差示扫描量热法。结果表明，在基体中观察到高密度和高数量的Al–Fe–Si颗粒，因此在用溶液处理后会导致形成更均匀且较小的重结晶晶粒。另外，在固溶处理期间形成较高体积分数的cubND和P型织构组分。而且，在中等Mg / Si比合金中获得了高r值和优异的深冲性。与其他两种合金相比，致密强化沉淀的形成导致更好的涂料烘烤硬化效果。此外，通过添加Si可以增强析出动力学，而添加Zn不会改变Al-Mg-Si合金的析出顺序。在175°C的烤漆处理过程中，研究的合金没有达到双相强化效果。

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