Abstract
The microstructure developed by two-phase lamellar eutectics $$(\alpha )$$ – $$(\theta {\text {-Al}}_{2}{\text {Cu}})$$ in Al-Cu and Al-Cu-Ag alloys is analyzed. A model of two-phase eutectic growth in multicomponent alloys is used to determine the scaling law of the eutectic microstructure using the alloy thermophysical properties. The application of the model to these alloys shows that the addition of Ag to Al-Cu alloys does not significantly change the length scale of the microstructure, which is in agreement with previous experimental studies. This is explained by the combined phenomena of the decrease in interface energies with the addition of Ag and the superheating of the $$(\alpha )$$ phase interface induced by the Ag composition profile.
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