Formation of phase icosahedral and decagonal quasicrystalline alloys Al<sub>62,2</sub>Cu<sub>25,3</sub>Fe<sub>12,5</sub>/Al<sub>65</sub>Ni<sub>15</sub>Co<sub>20</sub> influence on the oxidation
In this article we will cover a study of the formation of icosahedral and decagonal phases two quasicrystals Al62,2Cu25,3Fe12,5 And Al65Ni15Co20,and the influence of oxidation in this alloy. For this purpose research used the diffraction of X-ray (XRD), scanning electron microscopy (SEM)/Energy Dispersive Spectroscopy (EDS), Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TG) .The results displayed found aspects of morphological structural as well as the surface of the two compositions of quasicrystals, these were prepared and obtained in electric arc furnaces and induction and arc. Oxidation of Al62,2Cu25,3Fe12,5 alloy, intermetallic phases presented with combinations of alloying elements and above 675°C it was observed that the crystalline phase is stable. In icosahedral phase oxidation of aluminum forms a dense layer on the passivating outermost surface of the quasicrystal which causes depletion in both copper and iron.In Al65Ni15Co20 nominal composition of oxygen interaction occurs on the surface of symmetry 10 times plane perpendicular vector .The formation of a thin film of aluminum oxide having well-ordered hexagonal structure and with the opposition area decagonal phase with the lateral size of approximately 35 Å.
Keywords: quasicrystals; phases; icosahedral; decagonal; aluminum oxide
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