Main features and the driving force for the formation of the quasicrystalline phase in Al-Cu-Fe powders after mechanoactivation

The evolution of the phase and structural states during heating of a powder mixture of composition Al 65 Cu 23 Fe 12 subjected to mechanoactivation has been investigated. The solid-state transformations have been studied using Mössbauer spectroscopy, X-ray diffraction, and differential scanning calorimetry. The sequence of phase formation during heating was compared with the data on the heat of formation of binary solutions and compounds in the system. The analysis performed showed that the nature of transformations in the process of the formation of the quasicrystalline phase was caused by the thermodynamic parameters of the system.