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首页> 外文期刊>Journal of Materials Engineering and Performance >Effect of Holding Pressure on Microstructure and Mechanical Properties of A356 Aluminum Alloy
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Effect of Holding Pressure on Microstructure and Mechanical Properties of A356 Aluminum Alloy

机译：保持压力对A356铝合金微观结构和力学性能的影响

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摘要

In this study, the effect of holding pressure on microstructure and mechanical properties of low-pressure die cast A356 aluminum alloy was investigated. The results showed that the application of high holding pressure (300 kPa) generated castings with denser structure and superior mechanical properties. By increasing the holding pressure up to 300 kPa, the size of secondary dendrite arm spacing greatly reduced by 22.7% at the cooling rate of 1A degrees C/s and decreased by 12.8% at 10A degrees C/s. The Feret's diameter and aspect ratio of eutectic silicon particles decreased by 8.4 and 5.1% at the cooling rate of 1A degrees C/s and decreased by 9.3 and 6.4% at 10A degrees C/s, respectively. Meanwhile, the density of A356 aluminum alloy increased to 2.678 g/cm(3) and the area fraction of porosity decreased to 0.035%. Thus, tensile properties of A356 aluminum alloy obtained at high holding pressure were enhanced, especially the ductility. All these could be associated with the better filling capability and faster cooling rate caused by high holding pressure. In the analytical range of experimental conditions, the correlation of mechanical properties with process parameters was established by statistical models to predict the ultimate tensile strength and elongation of low-pressure die cast A356 aluminum alloy.
机译：在该研究中，研究了对低压模铸A356铝合金的对微观结构和力学性能的影响。结果表明，高保持压力（300kPa）产生的铸件具有密集结构和优异的机械性能。通过增加高达300kPa的保持压力，次级树枝状臂间距的尺寸在1a c / s的冷却速率下大大减少22.7％，并在10a℃/ s下降低12.8％。 Feret的直径和共晶硅颗粒的纵横比以1A的冷却速率降低了8.4和5.1％，分别在10A C / S下降低9.3和6.4％。同时，A356铝合金的密度增加到2.678克/厘米（3），孔隙率的面积分数降至0.035％。因此，提高了高保持压力下获得的A356铝合金的拉伸性能，尤其是延展性。所有这些都可以与更好的填充能力和更快的冷却速度相关联，引起的高保持压力引起。在实验条件的分析范围内，通过统计模型建立了机械性能与工艺参数的相关性，以预测低压模铸A356铝合金的最终拉伸强度和伸长率。

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