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首页> 外文期刊>Engineering failure analysis >Formation mechanism of pits on the surface of thin-wall die-casting magnesium alloy components
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Formation mechanism of pits on the surface of thin-wall die-casting magnesium alloy components

机译：薄壁压铸镁合金零件表面凹坑的形成机理

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摘要

A notebook personal computer casing, made of AZ91D alloy, is manufactured by precision die casting. When the computer casing was kept for some time, it was found that there were some small pits on the surface of the casing. The formation mechanism of the pits was investigated by means of scanning electron microscope and fourier transform infrared spectrophotometry. It is concluded that MgO inclusions in the Mg-Al alloy are an important factor, which leads to the formation of small pits. MgO turns into Mg(OH)_2 by absorbing water or steam. Because of density difference between MgO and Mg(OH)_2, volume expansion takes place. A basic way of reducing pits is to cut down the content of MgO inclusions.
机译：通过精密压铸制造由AZ91D合金制成的笔记本个人计算机外壳。将计算机机箱放置一段时间后，发现机箱表面上有一些小凹坑。通过扫描电子显微镜和傅里叶变换红外分光光度法研究了坑的形成机理。结论是，Mg-Al合金中的MgO夹杂物是重要的因素，导致形成小坑。 MgO通过吸收水或蒸汽而变成Mg（OH）_2。由于MgO和Mg（OH）_2之间的密度差异，会发生体积膨胀。减少凹坑的一种基本方法是减少MgO夹杂物的含量。

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