The paper presents deals with a quantification of intermetallic phases rich in copper in the alloy AlSi6Cu(X) with a variable content of copper, modified with strontium and during thermal treatment age hardening in artificial or natural way. It concerns variables occurring in the common industrial practice. The rate of solidification, thermal treatment regime and other elements of the alloy chemical composition were not be variated. Microhardness measurements related to a condition of 27 samples. Substructural TEM analysis characterizes the copper alloying condition of the structure matrix. Copper as a hardening element was identified by EDX analysis. Important process and material factors appealing to resultant mechanical properties of the alloy were identified, and the factors having a minimal effect were eliminated.
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