Abstract
Aluminum-based alloys containing quasicrystalline phases have good wear resistance due to their low wear coefficient and high hardness. The formation of quasicrystalline phases depends on the composition of the alloy and the imposition of high cooling rates on the molten metal. In the raw state of fusion, presenting β-type and Al13Fe4 monoclinic phases, they are present together with the quasicrystalline phase. A careful chemical composition control and an efficient heat treatment are necessary to obtain quasicrystalline phases. The objective of this work was to study the heat treatment in the homogenization of the quasicrystalline alloy Al64Cu27Fe15 obtained by smelting, in a controlled atmosphere. To understand the microstructural evolution, characterizations were made using SEM and XRD. The thermal treatment carried out for 24 hours, to obtain a microstructure with icosaedral phase coexisting with small increases in existing crystalline phases.
 
 Keywords: Quasicrystalline Phases. Microstructural Evolution. Phases of type β and Al13Fe4.
Highlights
Quasicrystals show the characteristics of both crystalline and noncrystalline materials [1]
Structural characteristics and thermal behaviour of the conventionally solidified Al–Cu–Fe alloys with nominal compositions of Al63Cu24Fe12 were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM)
SEM micrographs for Al63Cu24Fe12 alloy after annealing at 700oC for 4 h revealed the formation of pentagonal dodecahedrons in the quasicrystalline phase, with an edge size of about 30 μm Keywords: Quasicrystalline Phases, Al63Cu24Fe12, Phases ω/β-Al2Fe5(Cu)
Summary
Quasicrystals show the characteristics of both crystalline (i.e. generation of sharp peaks and spots in X-ray diffraction and electron diffraction patterns, respectively) and noncrystalline materials (i.e. absence of translational symmetry) [1]. Al-Cu-Fe is an attractive alloy system as the constituent elements of this system are non-toxic, available and of favorable cost. Among the available Al-based quasicrystalline alloys, the ternary Al-Cu-Fe quasicrystalline alloys are most popular due to non-toxicity, wide availability and cost-effectiveness of the constituent’s elements. Metastable QCs are formed in a wide range of binary alloy systems of Al with the dtransition metals. Stable QCs can be obtained when the third element is added to one of these binary systems. The third element could be one of the transition metals for example, coppe [3] Examples of these stable ternary quasicrystalline systems are icosahedral Al-Cu-Fe and decagonal Al-Cu-Co
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