The formation of quasicrystal phase in Al-Cu-Fe system by mechanical alloying

Abstract

In order to obtain quasicrystalline (QC) phase by mechanical alloying (MA) in the Al-Cu-Fe system, mixtures of elementary Al, Cu and Fe in the proportion of 65-20-15 (at. %) were produced by high energy ball milling (HEBM). A very high energy type mill (spex) and short milling times (up to 5 hours) were employed. The resulting powders were characterized by X-ray diffraction (XRD), differential scanning calorimetry (DSC) and scanning electron microscopy (SEM). QC phase was not directly formed by milling under the conditions employed in this work. However, phase transformations identified by DSC analysis reveals that annealing after HEBM possibly results in the formation of the ψ QC phase.

Development of Al1070-Quasicrystal (Al65Cu23Fe12) composites using friction stir processing and its mechanical characterization

“…The aforementioned peaks affirm the quasicrystal particles consists a combination of various impurity phases and CuAl 2 phase [34]. An increase in the intensity at angle 2θ=36°of FSPed alloy with respect to the base material may be due to the dynamic recrystallization process [35]. Al1070-quasicrystal composites exhibited various peaks at angle 2θ=42.5°and 26.5°corresponding to the planes of (110), (220) which is very much similar to the FSPed Al alloy.…”

Microstructure Refinement for Fe-34Mn-10Al-0.76C Alloy Using Variable Pulsing Magnetic Field (PMF) Solidification

“…All components were pressed together, while the powder was between them, as a result for shaking the mill. Which causing spherical milling that produces a microscopic structure with layers and an assumed powder composition (EckertL, Schultz, & Urban, 1989;TravessaI, Cardoso, Wolf, Junior, & BottaII, 2012).…”

Assessment of Al-Cu-Fe compound for enhanced solar absorption

“…MA has been used to successfully obtain single-phase structures for many systems, for example, for the mutually immiscible Fe-Cu system, the FCC structure of Cu(Fe) solid solution is acquired for iron contents lower than at 45% and BCC Fe(Cu) solid solution for iron contents higher than at 55% [19]. One attractive quasicrystalline system produced by MA is the metastable Al-Cu-Fe with its fivefold structural symmetry, in which the formation of the quasicrystalline phases can be accomplished and controlled by MA [24,25], because it is noted that the produced Al-Cu-Fe system can be either be stable or metastable depending on the methods used in its production, and this system can be produced by many synthesis techniques [27][28][29][30]. One attractive quasicrystalline system produced by MA is the metastable Al-Cu-Fe with its fivefold structural symmetry, in which the formation of the quasicrystalline phases can be accomplished and controlled by MA [24,25], because it is noted that the produced Al-Cu-Fe system can be either be stable or metastable depending on the methods used in its production, and this system can be produced by many synthesis techniques [27][28][29][30].…”

“…In between, the two phases, Cu(Fe) + Fe(Cu), exist together [21][22][23][24][25][26]. One attractive quasicrystalline system produced by MA is the metastable Al-Cu-Fe with its fivefold structural symmetry, in which the formation of the quasicrystalline phases can be accomplished and controlled by MA [24,25], because it is noted that the produced Al-Cu-Fe system can be either be stable or metastable depending on the methods used in its production, and this system can be produced by many synthesis techniques [27][28][29][30].…”