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首页> 外文期刊>Materials Science and Engineering >Effect of Sr-modi fication on the bendability of cast aluminum alloy A356 using digital image correlation method
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Effect of Sr-modi fication on the bendability of cast aluminum alloy A356 using digital image correlation method

机译：数字图像相关法研究Sr改性对铸造铝合金A356弯曲性能的影响

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摘要

The effect of cast microstructure on bendability of automotive cast aluminum alloy A356 has been studied by machining sheet specimens and conducting V-bend tests. Specimens in the loaded condition are observed from the through-thickness section using a CCD camera and also using a scanning electron microscope (SEM). The latter allowed recording of high magnification images from the through-thickness region of the bend to determine aspects of strain localization and particle induced damage in the microstructure. In addition, the initial microstructure is utilized as a speckle pattern for further analysis of through-thickness strain development in the bent region using digital image correlation (DIC) method. The method is applied to unmodified and Sr-modified A356 compositions. The results indicate superior bendability of Sr modified A356 alloy compared to the unmodified alloy. The differences in bendability are attributed to the size and morphology of eutectic Si phase particles that undergo significant cracking in the tensile region of specimen during bending. The results demonstrate that high magnification SEM imaging of bent specimens coupled with DIC based strain analysis offers a useful method of analyzing the effect of microstructure on bendability of cast materials.
机译：通过机加工薄板试样并进行V形弯曲试验，研究了铸造组织对汽车铸造铝合金A356弯曲性能的影响。使用CCD相机和扫描电子显微镜（SEM），从增厚部分观察处于加载状态的样品。后者允许从弯曲的整个厚度区域记录高倍率图像，以确定应变局部化和微粒引起的微观结构损伤的方面。此外，最初的微结构被用作散斑图样，以使用数字图像相关（DIC）方法进一步分析弯曲区域中的全厚度应变。该方法适用于未改性和Sr改性的A356组合物。结果表明，与未改性的合金相比，Sr改性的A356合金具有更好的弯曲性能。可弯曲性的差异归因于共晶硅相的尺寸和形态，该共晶硅相在弯曲过程中会在试样的拉伸区域发生明显的开裂。结果表明，弯曲样品的高倍SEM成像与基于DIC的应变分析相结合，为分析微观结构对铸造材料的可弯曲性的影响提供了一种有用的方法。

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