Substantiation of the Copper Concentration in Thermally Stable Wrought Aluminum Alloys Containing 2 wt % of Mn

Influence of Pre-Milling on the Mn Solid Solubility in the Al-Mn-Cu Alloy during Mechanical Alloying

“…The Al-Cu-Mn alloys have long been of interest in terms of increased high-temperature properties of lightweight constructions. Good high-temperature strength is observed for Al-Mn-Cu-based alloys; meanwhile, the service temperatures for the materials are below ~200 • C [65][66][67][68][69]. The conventional methods and compositions provide up to 1-2% Mn content in a solid solution, and the Al 20 Cu 2 Mn 3 is the main strengthening phase [70].…”

Effect of Iron and Silicon on the Phase Composition and Microstructure of the Al–2% Cu–2% Mn (wt %) Cold Rolled Alloy

“…Table 3 shows that the manganese concentration in all (Al) alloys except for 0.7Fe0.4Si is at least ~1.5% (i.e., at least 75% of its total amount in the alloy). The copper concentration is 0.6-0.8%, i.e., approximately the same as in the alloy without Fe and Si [10]. The aluminum solid solution in the 0.1Fe0.5Si alloy also contains 0.15% Si, which indicates that Al 15 Mn 2 Si 3 dispersoids are formed in a sufficiently large number during annealing [16].…”

“…The operating temperatures of these alloys are about 250°C, and this level can hardly be significantly increased by traditional alloying [4][5][6]. A major disadvantage of 2xxx alloys is the necessary homogenization of ingots and quenching of deformed semifinished products [7][8][9][10][11].…”

“…The model Al-2% Cu-2% Mn alloy (wt %) was shown [10,12] to have advantages in processability and heat stability over standard AA2219-type alloys.…”

“…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).…”