Abstract
The present work aimed to characterize the microstructure of the icosahedral phase (quasicrystalline phase-ϕ) of the system with stoichiometric composition of the quasicrystal Al65Cu25Fe15 . The ternary alloy with nominal composition of Al63Cu25Fe12 was processed by mechanical alloying (MA) as a viable solid state processing method for producing various metastable and stable quasicrystalline phases. The structural characterization of the obtained samples was performed by X-ray diffraction (XRD) and scanning electron microscopy (SEM), while the elemental composition was determined by dispersive energy spectroscopy (DES). The diffraction patterns of Al65Cu25Fe15 showed the presence of ω-Al7Cu2Fe , β-Al(Fe, Cu) and λ-Al13Fe4 phases that coexist with the thermodynamic quasicrystalline phase-ϕ. Finally, elemental analysis indicates that during alloy synthesis there is little variation of the ideal composition. The results indicate that alloys with high percentage of icosahedral phase can be obtained by casting in the air.
Highlights
Quasicrystals are defied as a solid which has the sharp Bragg peaks as a conventional crystal but loses the lattice translational symmetry in physical space
We increased the proportion of the quasicrystalline phase, and performed a heat treatment to favor the peritoneal transformation of these phases
The scanning electron microscopy (SEM)/ dispersive energy spectroscopy (DES) analysis was performed by a LEO scanning electron microscope model 1430 with OXFORD microprocessor for DES model 7353 coupled with a voltage between 5 and 20kV, after the sample was coated with a layer of gold deposited under vacuum in order to increase the contrast
Summary
Quasicrystals are defied as a solid which has the sharp Bragg peaks as a conventional crystal but loses the lattice translational symmetry in physical space. The quasicrystals have many attractive properties, such as high hardness, low electrical and thermal conductivities, low surface energy, accompanied by low coefficient of friction, high resistance to oxidation and corrosion, and unusual optical properties that were not observed for crystalline alloys [3] Such properties of quasicrystalline materials have been exploited for application of heterogeneous catalysts in processes and catalytic supports in catalytic oxidation reactions of methanol. The quasicrystalline phases, morphological and structural characteristics of the conventionally solidified Al65Cu25Fe15 alloy were investigated using techniques X-ray diffraction (XRD), scanning electron microscopy (SEM) and dispersive energy spectroscopy (DES). It was studied the conditions of grinding and thermal treatment to obtain the icosahedral phase and quasicrystalline phase-φ in the quasicristal Al65Cu25Fe15
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Journal of Experimental Techniques and Instrumentation
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
