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The microstructure characteristics of AlSiCuMg cast alloys were studied with different Cu content and the grad-ual solution treatment by DSC, SEM, TEM and mechanical method. The melting point of α(Al) + Si decreases and poly-nary eutectic phases with low melting point form with increase of Cu content. Gradual solution treatment includes two steps: solution treating near the melting point of polynary eutectic phase to take it dissolve first, and then increasing solution tem-perature to take the remainder copper intermetallics dissolved into α(Al). Grain boundaries melting can be avoided by gradual solution treatment, even the maximum solution temperature is above final solidification point, and the age harden-ing response increases correspondingly.
The microstructure characteristics of AlSiCuMg cast alloys were studied with different Cu content and the grad-ual solution treatment by DSC, SEM, TEM and mechanical methods. The melting point of α (Al) + Si decreases and poly-nary eutectic phases with low melting Gradual solution treatment includes two steps: solution treating near the melting point of polynary eutectic phase to take it dissolve first, and then increasing solution tem-perature to take the remainder of copper intermetallics dissolved into α (Al) Grain boundary melting can be avoided by gradual solution treatment, even the maximum solution temperature is above final solidification point, and the age harden-ing response increases correspondingly.