Abstract
In this investigation, a systematic study on the effects of the composition and annealed treatments in the formation of the AlCuFe icosahedral phase is carried out. The experimental results obtained from 30 different compositions under normal solidification methods and rapid solidification techniques show that the main driving force to the formation of the icosahedral phase is a cubic phase known in the past as the β phase. The β (AlCuFe) phase has a crystalline structure similar to the compound Al50Fe50. However, its lattice parameter is different from the parameter corresponding to the binary compound Al50Fe50, and it varies depending on the amount of copper. This gives rise to a cubic solid solution, the so-called β phase. The studied compositions were in the ranges of: Al(73–55 at.%), Cu(20–25 at.%) and Fe(10–15 at.%). Different structural and chemical characterization techniques were employed such as: X-ray diffractometry, scanning electron microscope (SEM) with EDS attachments, transmission electron microscopy (TEM) and differential thermal analysis (DTA) observations.
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