the π-AlSiMgFe phase has tendency to transforms into β-AlFeSi through the solution heat treatment [14,15]. Taylor showed that most of the π phase was transformed to small clustered needless of β and there was an accompanying release of Mg into solution that allows maximum predicted Mg matrix levels to be reached [15]. Related research work on mechanical properties of these alloys has also shown that optimum tensile properties occur in the same 0.4–0.5% Mg alloy range in which partial π to β transformation occurs [21].