On the relationships between isothermal phase diagrams and quasicrystalline phase transformations in AlCuFe alloys

In order to determine the crystalline phases which coexist with the icosahedral quasicrystalline phase at high temperatures, an isothermic section of the AlCuFe equilibrium phase diagram at 850°C was studied. This section is near to composition and temperature values where the icosahedral phase was formed from the cubic phase. The quasicrystalline phase is not found in a region of a single phase. However, it has binary stability fields with the cubic β-Al5(Cu,Fe)5 phase and ternary stability fields with the β+λ-Al13Fe4.