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Abstract
The combined effect of the main alloying elements on the mechanical properties and fluidity of the secondary foundry alloy AlSi9Cu3 has been investigated. Systematic compositional variations within the alloy's tolerance limit illustrate the broad spectrum of attainable properties. The yield strength in the as cast condition can be adjusted from 100 to 200 MPa, while the elongation to fracture can be simultaneously varied between 0·35% and almost 4%. Additionally, variation in fluidity by more than 100% can be achieved. The microstructure–property relationship is interpreted in the light of thermodynamic calculations that reveal a significant mutual interaction of the alloying elements.