Mn、Sr对铝硅合金中铁相的影响

摘要

研究了Mn、Sr元素对低铁(质量分数为0.5％)和高铁(质量分数为1％)铝硅合金中铁相的影响,分析了A1-Fe-Si相的成分及形态.结果表明:随着Mn元素含量的增加,铝硅合金中针状铁相逐渐减少,而鱼骨状铁相逐渐增多；Sr元素的添加并不能改变铝硅合金中的铁相形态,但能使合金内共晶Si相的形态由针状变成纤维状；复合添加Mn、Sr元素后,铝硅合金中α-AlFeSi相均匀分布于α-Al枝晶中,且尺寸比单独添加Mn的合金更为细小.%The influence of Mn, Sr respectively on the iron-phase in the high iron content and low iron content of Al-Si alloy was studied and the composition and morphology of Al-Fe-Si phase were analyzed. The results show that as the?increase of Mn, needle-like iron phase in Al-Si alloy decreases, while the fishbone-like iron-phase increases. The morphology of iron-phase is not changed in the low iron and high iron content of Al-Si alloys with the addition of Sr, but the eutectic Si phase changes into a fibrous morphology. When both Mn and Sr are added in Al-Si alloys, the o-AIFeSi phase distributes in the oc-AI dendrites homogenously and the size is smaller than that in the Al-Si alloy with only Mn.