The effect of addition of Sc on as-cast microstructure of Al9.0Zn2.5Mg2.2Cu0.2Zr alloy
The research was conducted on the effect of Sc addition on the as-cast organiza-tion of Al9.0Zn2.5Mg2.2Cu0.2Zr aluminum alloy.The results show that the second phase of Al3(Sc,Zr),which can be formed by the synergy of trace Sc and Zr,has the functions of promoting non-homogeneous nucleation and refining the as-cast grains during casting process,and it has an obvious metamorphic effect on the eutectic microstructure of the alloy.However,some primary Al3(Sc,Zr)second phases in cast alloys that can reach the microm-eter level may adversely affect the machinability and mechanical properties of the alloys.
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