The consequences of solid-state reactions in mechanically alloyed Al-Cu-Fe powders were studied using advanced techniques of X-ray diffraction pattern interpretation. A set of intermetallic phases was identified which appeared as a result of mechanical alloying and subsequent annealing. These intermetallics were the intermediate products formed during to gradual mechanical and thermal homogenization and excitation. The quantitative phase composition of mechanically alloyed powders was determined using interactively controlled database phase analysis, fitting procedures and modelling of X-ray patterns for different structures. The analysis allowed us to optimize the processing route, and identify the conditions promoting the formation of single phase quasicrystalline powder. Single phase powders of the quasicrystalline Al6Cu2Fe intermetallic (ψ-phase) were obtained from the mixture of elemental powders Al70Cu20.3Fe9.7 after a short time milling and annealing at 800 °C under argon.
|Journal||Materials Science Forum|
|Publication status||Published - 2000|
|Event||Proceedings of the 1998 6th European Powder Diffraction Conference (EPDIC 6) - Budapest, Hung|
Duration: 22 Aug 1998 → 25 Aug 1998