AlSi9Cu3(Fe)aluminum alloy is widely used in casting aluminum alloy.Casting temperature is an important process parameter to obtain excellent mechanical properties of hypoeutectic Al-Si alloy.The evolution of Fe-containing intermediate compounds in AlSi9Cu3(Fe)cast aluminum alloy by testing the α-Fe and β-Fe content at different casting temperatures was studied.AlSi9Cu3(Fe)alloys with Fe content of about 0.7wt％were prepared at different temperatures ranging from 680 ℃ to 960 ℃ and casting temperature interval of 70 ℃.The results show that the secondary dendrite arm spacing of AlSi9Cu3(Fe)alloy does not change significantly at different casting temperatures.When the casting temperature is higher than 890 ℃,the precipitation of harmful β-Fe phase is inhibited in a certain extent.At the same time,the bulk or Chinese character shape α-Fe phase becomes the dominant phase of the microstructure.When the casting temperature is high,the equilibrium condition of Fe-rich phase crystallizing into steady β-Fe phase is broken,and the metastable α-Fe phase is more easily formed.
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