683
Quinary, Senary Diagrams Al-Cu-Fe-Mg-Mn Aluminum- Copper-Iron-MagnesiumManganese system The equilibria in the system have been investigated by [1]. Besides the binary, ternary and quaternary invariant reactions that have been reported under the appropriate headings, the following quinary reactions exist: liq. + Cu2FeAl7— Al + Cu2Mn3Al20 + CuMgAl2 + (CuFeMn)Al6 liq.—- Al + FeAl3 + (CuFeMn)Al6 + CuMg4Al6 + Mg5Al8 liq.—> Al + Cu2FeAl7 + Cu2Mn3Al20 + CuAl2 + CuMgAl2 No exact data on temperature and location of the reactions are given, but it appears that, for the two eutectic reactions, the amount of FeAl3, (CuFeMn)Al6, Cu2FeAl7 and Cu2Mn3Al20 in the eutectic is small and therefore temperature and composition are close to those of the ternary eutectics Al-CuMg 4 Al 6 -Mg 5 Al 8 (2.7% Cu, 32% Mg, 722 °K) and Al-CuAl 2 -CuMgAl 2 (33% Cu, 6% Mg, 780 °K), respectively. In the solid state the phases that can be present are: CuAl2, FeAl3, Mg5Al8, CuMgAl2, CuMg4Al6, Cu2FeAl7, Cu2Mn3Al20 and (MgMn)3Al10. For illustrations of the liquidus the original publication should be consulted. REFERENCE 1. G. Phragmen, JIMMA 17,910
Al-Cu-Fe-Mg-Si Aluminum- Copper-Iron-MagnesiumSilieon system Although scattered information as to the structure of alloys in this system can be found in a variety of publications, the only systematic investigation of the diagram is that of [1]. In Table 3.54 are listed the invariant reactions; for illustrations of the liquid the original publication should be consulted. Alloys containing 30—35% Mg and small amounts of copper, iron, silicon were investigated by [2]. The main finding is that the presence of FeAl3 and/or Mg2Si does not lower the freezing point of the Al-Mg 5 Al 8 eutectic by more than 2 - 3 °K.