CALCULATION OF THE AL–CU–ZN–MG И AL–CU–ZN–MG–FE–SI SYSTEM PHASE DIAGRAMS

Abstract

Using the results of thermodynamic calculations with «Thermo-Сalc» software package, the fragments of the Al–Cu–Zn–Mg and Al–Cu–Zn–Mg–Fe–Si– (Mn) phase diagrams in the range of densities, (%): 4–6 Сu, 2–4 Zn, 0,5–2,0 Mg, 1,5–2,0 Fe, 1,5–5,0 Si have been built as well as the composition of the solid solution for a number of alloys of the Al–Cu–Zn–Mg–Fe–Si–(Mn) system has been calculated at temperatures near to the solidus line. The X-ray microspectral analysis was used for experimental proof of the thermodynamic calculations, which show the satisfactory precision of the calculated and experimental data. It is found that maximally alloyed aluminum solid solution can be produced at an iron and silicon density ratio of Fe/Si = 0,5 for the alloys of the Al–Cu–Zn–Mg–Fe–Si–(Mn) system.