铝硅系铸造铝合金的原位统计分布分析

Original position statistic distribution analysis for aluminum/silicon casting aluminum alloys

采用原位统计分布分析技术(OPA)对压铸铝合金样品进行了成分分布分析,通过选择合适的铝合金光谱标样和分析参数,实现了压铸铝合金中Si、Fe、Cu、Mn和Ti的成分分布的准确分析。实际样品中Si、Fe、Cu、Mn和Ti的含量定量分析结果与火花光谱仪的测定结果有较好的一致性。通过对五种元素的扫描分析可知,两种样品中Si、Cu和Ti的分布较为均匀,但对于Fe、Mn两个元素,两块样品均存在明显的偏析,且其成分分布极其相似,由通道合成结果可知,Fe、Mn是以一定比例的化合物的形式存在于铝合金中,这与扫描电镜和能谱分析的结果一致。

The element distribution analysis for the Al-Si casting aluminum alloys has been done by metal original position analyzer（OPA）. The quantitative distribution analysis results of Si, Fe, Cu, Mn and Ti have been obtained by selecting suitable spectrum reference materials and optimizing the in- strumental parameters. The content results of five elements by OPA method have good coincidence with the values determined by spark source atomic emission spectrometer. The scanning analysis results show that the distribution of Si, Cu and Ti is homogeneous and some obvious segregation of Fe and Mn has been found in two real aluminum alloys and the content distributions of two elements are very similar. It can be concluded that there are some compound of Fe and Mn in casting aluminum al- loys by the result of multi-element spectrum channel combination analysis. The conclusion also has good agreement with the results by scanning electron microscope and energy spectrum analysis.