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采用OM、XRD、SEM、EDS和Thermal-calc研究了不同Mn含量对A356合金中铁相形貌的影响并进行了相图分析。结果表明,在结晶凝固过程中,Mn与Fe形成新的化合物,使富Fe相由针状的β-Al5FeSi相转变成颗粒状或汉字状的α-Al(Fe,Mn)Si相;A356铝合金凝固过程的结晶相为:α-Al、α-Al(Mn,Fe)Si、β-Al5FeSi和Mg2Si。相图分析发现,增加Mn含量使得α-Al(Mn,Fe)Si相开始析出温度升高,有利于α-Al(Mn,Fe)Si相生长,形成树枝状或汉字状Fe相。
The effects of different Mn contents on the phase morphology of iron in A356 alloy were investigated by OM, XRD, SEM, EDS and Thermal-calc. The results show that during the solidification process, Mn forms a new compound with Fe and the Fe-rich phase changes from acicular β-Al5FeSi to α-Al (Fe, Mn) Si phases in granular or Chinese character. The solidification phase of the alloy is α-Al, α-Al (Mn, Fe) Si, β-Al5FeSi and Mg2Si. The phase diagram analysis shows that increasing the Mn content makes the precipitation temperature of α-Al (Mn, Fe) Si start to increase, favoring the growth of α-Al (Mn, Fe) Si phase and forming dendritic or kink-shaped Fe phase.