采用光学显微镜、X射线衍射仪研究了锰、锶含量对铸造铝硅合金铁相形貌和相组成的影响。结果表明:在含0.02%锶的铝硅合金中,随着锰含量的增加,针片状β-Al9Fe2Si2相转变为骨骼状AlSiMnFe相,但锰的质量分数超过0.5%后,AlSiMnFe相以规则形状出现;在含0.3%锰的铝硅合金中,随着锶含量的增加,AlSiMnFe相和β相的尺寸变小,β相甚至消失,MgSi2相有转变为Al8Mg3FeSi6相的趋势,但当锶的质量分数超过0.03%后,AlSiMnFe相出现了聚集,锶的质量分数达到0.05%时,出现了有规则形状的AlSiMnFe相。

The influences of Mn and Sr contents on the iron phase morphology and phases composition of cast Al-Si alloy were studied by optical microscopy and X-ray diffraction. The results show that, for the Al-Si alloy containing 0.02wt%Sr, with the increase of Mn content, needle-like β-Al9Fe2Si2 phase transformed into skeleton-like AlSiMnFe phase, but when the Mn content was above 0.5wt%, AlSiMnFe phase would appear in the form of polyhedral shape. For the Al-Si alloy containing 0.3wt%Mn, with the increase of Sr content, AlSiMnFe phase and β phase all would be broke, β phase even disappeared, and there was a tendency that MgSi2 transformed into Al8Mg3FeSi6 phase, but when Sr content was above 0.03wt%, AlSiMnFe phase would aggregate, when Sr content was above 0.05wt%, AlSiMnFe phases would appear in the form of polyhedral shape.