A comparative study of the Al–Co–Pd and Al–Co–Ni alloy systems

Yurechko, M.; Grushko, B.; Velikanova, Т. Ya.; Urban, K.

doi:10.1016/j.jallcom.2003.08.005

Cited by 16 publications

(15 citation statements)

References 23 publications

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“…The quasicrystal of composition Al 65 Ni 15 Co 20 the DSC curve pointed to similar factors with Al-Cu-Fe; but we note that the endothermic peak occurred at a temperature transition between 320 °C and 400 °C. Further, research done previously considered that the phase boundaries are shifted from the use of the mechanical synthesis process.…”

Section: Dsc and Tg Thermal Analysissupporting

confidence: 55%

“…Samples of the quasicrystalline alloys were duly weighed and warmed to room temperature (approximately 27 o C) to 750 o C at a heating rate of 10 o C/ min under an inert atmosphere with a nitrogen flow of 50 ml / min. 15 Co 20 ), as shown respectively below. In the diffractogram 4 with the use of the Rietveld method, it observed the location of the main peak of the quasicrystalline alloy in 45° 2θ, is the I-quasicrystalline, the second most evident peak is attributed to the β crystalline phase lies in 30° 2θ; the other peaks are of the monoclinic phase λ-Al 13 Fe 4 , the other peaks are related to the cubic structure of the type of CsCl, (β-AlFe (Cu) or τ-AlCu (Fe) and the tetragonal phases θ-Al 2 Cu were also detected.…”

Section: Methodsmentioning

confidence: 97%

“…2 Cu 25.3 Fe 12 . 5 and Al 65 Ni 15 Co 20 ), mechanically homogenized and compacted in the form of a disc with diameters of 10 mm and 2 mm thickness, in a hydraulic uniaxial press. Initially a pre-press was made under a maximum load of 5 ton for 3 minutes.…”

Section: Methodsmentioning

confidence: 99%

“…In this sequence Al-Co, AlNi, and AI-Co-Ni periodicities of approximately 04.0,8,1,2 and 1,6nm in a specific direction, was meaning that there was a rapid solidification in this composition. For identification of the Al 65 Ni 15 Co 20 alloy planes formed by five reciprocal vectors, corresponding to five adjacent planes with an angle of 2 5 π , plus six vectors perpendicular to the other planes 15 . By Rietveld, verified the location of the peak with more intensity in the decagonal phase of the quasicrystalline alloy is 43.5° 2θ, θ-decagonal phase, and other peaks refers to 31.5° 2θ, the -crystalline phase.…”

Section: X-ray Difratogrammentioning

confidence: 99%

“…By Rietveld, verified the location of the peak with more intensity in the decagonal phase of the quasicrystalline alloy is 43.5° 2θ, θ-decagonal phase, and other peaks refers to 31.5° 2θ, the -crystalline phase. The quantification of the elements that make up the quasicrystalline alloy Al 65 Ni 15 Co 20 , after a 48-hour heat treatment and temperature in a range of 900 °C. It identified a percentage of Nickel with 27.2%; a cubic structure coded 9006039 of 48.4%; a spinel structure with a percentage of 24.4%.…”

Section: X-ray Difratogrammentioning

confidence: 99%

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EVOLUTION OF THE PHASES OF QUASICRYSTALLINE ALLOYS ICOSAHEDRAL/ DECAGONAL Al62.2Cu25.3 Fe12.5/Al65Ni15Co20 AND OXIDATIVE BEHAVIOR

Jamshi¹,

Rodbari²

2018

J. Chil. Chem. Soc.

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In this paper, we present an approach and investigation on the evolution of the icosahedral and decagonal phases of quasicrystalline alloys Al 62 . 2 Cu 25 . 3 Fe 12 . 5 E Al 65 Ni 15 Co 20 , the oxidation behavior in them. The quantification of the quasicrystalline and crystalline phases present in the quasicrystals provides important information in the mass transport by diffusion, as well as the phase transformations that occurred. For this purpose, X-ray diffraction (XRD) and Rietveld Method Quantification, Scanning Electron Microscopy (SEM) / Dispersive Energy Spectroscopy (EDS), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis). The results showed structural aspects of the two compositions of quasicrystals, these were elaborated and obtained in an arc induction furnace. The oxidation of the alloy Al 62 . 2 Cu 25 . 3 Fe 12 . 5 showed intermetallic phases with associations of the elements of the alloy and above 735 °C was observed that the crystalline phase is stable in the icosahedral phase. The quasicrystals Al 65 Ni 15 Co 20 , with the interaction of oxygen, happens in the surface of symmetry 10 times plane perpendicular vector. The formation of a thin film of the aluminum oxide with a well ordered hexagonal shape structure, with a domain opposite the decagonal phase with lateral size at about 35 Å.

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Section: Dsc and Tg Thermal Analysissupporting

confidence: 55%

Section: Methodsmentioning

confidence: 97%