“…Since this model alloy was prepared based on highpurity aluminum, the question about the effect of Fe and Si impurities, which are certainly present in the vast majority of commercial alloys, remains open. Particularly, even small amounts of Fe and Si make the phase composition of Al-Cu-Mn alloys much more complex [10]. The basic ternary system allows the formation of only three phases (Al 6 Mn, Al 20 Cu 2 Mn 3 , Al 2 Cu) in addition to the aluminum solid solution (hereafter (Al)), but the presence of Fe and Si results in the formation of seven more phases: Al 3 Fe, (Al,Cu) 6 (Fe,Mn,Cu), Al 7 Cu 2 Fe, Al 15 (Fe,Mn) 2 Si 3 , Al 5 FeSi, Al 8 Fe 2 Si, and (Si).…”