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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Solution Heating Rate on Quasi-static and Dynamic Mechanical Properties of Al-Mg-Si-Cu Alloy
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Effect of Solution Heating Rate on Quasi-static and Dynamic Mechanical Properties of Al-Mg-Si-Cu Alloy

机译：溶液加热率对Al-Mg-Si-Cu合金准静态和动态力学性能的影响

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摘要

The effect of solution heating rate on quasi-static and dynamic mechanical properties of Al-Mg-Si-Cu alloy in bake hardening state was investigated through mechanical properties, microstructure and fracture morphology characterization in the present study. The results show that solution heating rate has a strong influence on microstructure, quasi-static and dynamic mechanical properties. As solution heating rate rises, the grain microstructure transforms from the elongated grains to equiaxed grains and the fraction of low-angle grain boundaries (LAGBs) also decreases. Moreover, the equivalent average grain size first decreases, and then increases. The relationship between solution heating rate and mechanical property is monotonic, not depending on strain rate. As solution heating rate rises, the yield strength, ultimate tensile strength and elongation decrease. In contrast to quasi-static loading, dynamic loading always tends to improve strengths and elongation. In addition, compared with the quasi-static tensile specimens, the dynamic tensile specimens possess a larger number of dislocations. Regardless of strain rate and solution heating rate, all the tensile specimens exhibit the ductile fracture mode. As solution rate rises, the dimples decrease and become shallow gradually. The dimples in dynamic fracture zone are larger and deeper than those in the quasi-static fracture zone.
机译：通过在本研究中，通过机械性能，微观结构和断裂形貌表征研究了溶液加热速率对Al-Mg-Si-Cu合金的准静态和动态力学性能的影响。结果表明，溶液加热速率对微观结构，准静态和动态机械性能有很大影响。随着溶液加热速率上升，从细长的晶粒转换为等式晶粒，低角度晶界（LAGBS）的分数也降低。此外，等效的平均晶粒尺寸首先降低，然后增加。溶液加热速率与机械性能之间的关系是单调的，而不是根据应变率。随着溶液加热速率上升，屈服强度，极限拉伸强度和伸长率下降。与准静态负载相比，动态载荷始终倾向于改善强度和伸长率。另外，与准静态拉伸试样相比，动态拉伸样品具有较大数量的脱位。无论应变率和溶液加热速率如何，所有拉伸试样都表现出韧性裂缝模式。随着溶液速度上升，凹坑逐渐降低并变浅。动态骨折区中的凹坑比准静态断裂带中的凹部更大。

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