Al–Cu–Fe–Mg–Mn–Si Aluminum–Copper–Iron–Magnesium–Manganese–Silicon system

688 As shown in Figure 3.99, the effect of zinc on the structure of aluminummagnesium-manganese-silicon alloys is very minor. Additions up to 8% Zn do not produce any new phase and at 733 °K the zinc is in solid solution, so that only the aluminum-magnesium-manganese-silicon phases are present. At lower temperatures some zinc-bearing phases such as Mg3Zn3Al2, MgZn2 and Mg 2 Zn n must appear, but it can be expected that they will show approximately the same range of existence as in the ternary aluminum-magnesium-zinc alloys, the only difference being that as magnesium content must be taken the effective magnesium—that is, the total magnesium minus the magnesium in Mg2Si. The properties can be expected to be very close to those of commercial alloys whose iron content is small and has little effect on properties. REFERENCE 1. H. J. Axon, etc., JIMMA 16, 701

Al-Cu-Fe-Mg-Mn-Si Aluminum-Copper-Iron-MagnesiumManganese-Silicon system In the report of [ 1 ] the liquidus surfaces for several sections at increasing manganese contents are shown. Unfortunately, in these sections the errors in the ternary, quaternary and quinary systems have piled up, so that many of the areas of the sections are incorrect. Moreover, most of the alloys of this system do not freeze under equilibrium conditions and are used after extensive working and heat treatment, which tend to produce equilibrium in the solid state. Thus, a knowledge of the beginning of freezing has little value. Table 3.58 shows all the phases known to form in the system and gives a tentative list of the phases that cannot coexist in equilibrium. REFERENCE 1. G. Phragmen, JIMMA 17, 910

689 Table 3.58 PHASES FORMED IN THE ALUMINUM-COPPER-IRON-MAGNESIUM-MANGANESE-SILICON SYSTEM AND PHASES WITH WHICH THEY CANNOT BE IN EQUILIBRIUM

Phase Al CuAl2 FeAl3 Mg5Al8 MnAl6 Si (CuFe)Al6 Cu 2 FeAl 7 CuMgAl2 CuMg4Al6 (FeMn)Al6 Fe2SiAl8 FeSiAl5 Cu2Mn3Al20 (MgMn)3Al10 Mg2Si (CuFeMn)3Si2Al15 (CuFeMn)Al6 Cu2Mg8Si6Al5 FeMg3Si6Al8

Cannot be in equilibrium none Mg5Al8, CuMg4Al6, FeAl3, (MgMn)3Al10 CuAl2, Si, FeSiAl5, (CuFeMn)3Si2Al15 CuAl2, Si, CuMgAl2, Cu2Mn3Al20, FeSiAl5, Fe2SiAl8 (?), (CuFeMn)3Si2Al15, Cu2Mg8Si6Al5 CuAl2, Si, (FeMn)Al6, Fe2SiAl8, FeSiAl5, (CuFeMn)Al6, FeMg3Si6Al8 FeAl3, Mg5Al8, MnAl6, (CuFe)Al6, CuMgAl2, CuMg4Al6, (FeMn)Al6, Fe2SiAl8, (MgMn)3Al10, (CuFeMn)Al6 Mg5Al8, MnAl6, Si, (FeMn)Al6, FeSiAl5, (MgMn)3Al10, (CuFeMn)3Si2Al15, (CuFeMn)Al6, Cu2Mg8Si6Al5 FeAl3, Mg5Al8, MnAl6, CuMg4Al6, Cu2Mn3Al20, Fe2SiAl8, (MgMn)3Al10, FeMg3Si6Al8, (CuFeMn)3Si2Al15, (CuFeMn)Al6, Cu2Mg8Si6Al5 Mg5Al8, Si, Fe2SiAl8, FeSiAl5, (MgMn)3Al10, (CuFeMn)3Si2Al15, (CuFeMn)Al6, Cu2Mg8Si6Al5, FeMg3Si6Al8 CuAl2, Si, Fe2SiAl8, FeSiAl5, (CuFeMn)3Si2Al15, Cu2Mg8Si6Al5, FeMg3Si6Al8 MnAl6, Si, (CuFe)Al6, Cu 2 FeAl 7 , Fe2SiAl8, FeSiAl5, Cu2Mg8Si6Al5, FeMg3Si6Al8 Mg5Al8, MnAl6, Si, (CuFe)Al6, CuMgAl2, CuMg4Al6, Cu2Mn3Al20, (FeMn)Al6, (MgMn)3Al10, (CuFeMn)3Si2Al15, (CuFeMn)Al6 FeAl3, Mg5Al8, MnAl6, (CuFe)Al6, CuMgAl 2 , CuMg4Al6, Cu2Mn3Al20, (FeMn)Al6, (MgMn)3Al10, (CuFeMn)Al6, (CuFeMn)3Si2Al15 FeAl3, Si, Fe2SiAl8, FeSiAl5, (MgMn)3Al10, FeMg3Si6Al8, (CuFeMn)3Si2Al15 CuAl2, FeAl3, Si, (CuFe)Al6, Cu 2 FeAl 7 , CuMgAl2, Cu2Mn3Al20, Fe2SiAl8, FeSiAl5, (CuFeMn)Al6, Cu2Mg8Si6Al5, FeMg3Si6Al8, (CuFeMn)3Si2Al15 none FeAl3, Mg5Al8, (CuFe)Al6, Cu 2 FeAl 7 , CuMgAl2, CuMg4Al6, (MgMn)3Al10, (CuFeMn)Al6 Mg5Al8, MnAl6, Si, (FeMn)Al6 Mg5Al8, CuMgAl2, CuMg4Al6, (MgMn)3Al10, (CuFeMn)3Si2Al15 Mg5Al8, MnAl6, CuMgAl2, CuMg4Al6, (FeMn)Al6, FeSiAl5