Investigação da Oxidação do Quasicristal Al62,2Cu25,3Fe12,5 na Fase Icosaedral

Luciano Nascimento; Lourdes Cristina L. A. Jamshidi; Celmy Maria B. de Menezes Barbosa

doi:10.22481/exon.v6i1.20429

Authors

Luciano Nascimento Universidade Federal de Pernambuco
Lourdes Cristina L. A. Jamshidi Universidade Federal de Pernambuco
Celmy Maria B. de Menezes Barbosa Universidade Federal de Pernambuco

DOI:

https://doi.org/10.22481/exon.v6i1.20429

Keywords:

Oxidation, Quasicrystalline Phases, Characterization

Abstract

The oxidation of the icosahedral phase Al62,2Cu25,3Fe12,5 is investigated by means of X-ray diffraction
(XRD), energy dispersive spectroscopy (EDS) and scanning electron microscopy (SEM). The stages of
the oxidation take place under very low pressure, which cause the nucleation and growth of the oxide
layer on the surface of the quasicrystalline. The quasicrystalline alloy was characterized at ambient
temperature, before and after oxidation. Oxidation leads to a long range diffusion of aluminum atoms
on the lattices, which forms an amorphous oxide layer on top of the grains. When the aluminum loses
inside the grains, there is an icosahedral phase transformed into intermetallic phase of the crystalline
type. Oxidation of quasicrystalline Al62,2Cu25,3Fe12,5 alloy was analyzed under different conditions of
heat treatment duration. This change no longer occurs when the grain size is larger than a critical value.
In the icosahedral phase, aluminium oxidation forms a dense, passivating layer at the outermost surface
of the quasicrystal which causes depletion of both copper and iron. The presence of hematite was
observed as well as alumina in the dense layer.

Downloads

Download data is not yet available.

References

. YIN,S.; LI,C.; BLANB,Q.; LUA,M. Effect of composition on the formability of quasicrystalline phase in mechanically alloyed Al–Cu Fe powders. Materials Science and Engineering A 496, p. 362–365, 2008.

. AGOSTINHO, L. C. L.; BARBOSA, C.M.B.M.; NASCIMENTO, L.; RODBARI,J.R. Catalytic Dehydration of Methanol to Dimethyl Ether (DME) Using The Al62,2Cu25,3Fe12,5

Quasicrystalline Alloy .J. Chem. Eng. Process. Technol. 4,p.2-8,2013.

. WEISSKOPF, Y.; ERBUDAK, M.; LONGCHAMP, J.N.; T. MICHLMAYR, T. Ni deposition on the pentagonal surface of an icosahedral Al–Pd–Mn quasicrystal, Surf. Sci. 600, p.2594–2599, 2006.

. WEHNER, B. I.; MEINHARDT, J.; KÖSTER, V.; ALVES, H.; ELIAZ, N; ELIEZER, D. Oxidation hydrogenation of quasicrystals, Materials Science and Engineering, A 226-228, p.1008-1011,1997.

. JORGENSEN, S.E.; JENSEN, A. Hydrolysis and Chemical Redox Processes , In:

Mathematical Submodels in Water Quality Systems, Elsevier Sc. Publ.,p. 408-410,1989.

. ESTRELLA, M; BARRIO,L.; ZHOU,G.; WANG,X.;WANG,Q.; WEN, W.;

HANSON,J.C; FRENKEL,A.I; RODRIGUEZ,A.J. In Situ Characterization of CuFe2O4 and Cu/Fe3O4 Water-Gas Shift Catalysts. J. Phys. Chem. C 113, p.14411–14417, 2009.

. CARRIAZO,J.G.; GUELOU,E.; BARRAULT,J.; TATIBOUËT,J.M.; MORENO, S.Catalytic wet peroxide oxidation of phenol over Al–Cu or Al–Fe modified clays. Applied Clay Science 22, p.303– 308, 2003.

. XIANG, J.H.; NIU, Y.; GESMUNDO, F. The oxidation of two ternary Fe–Cu–10 at.% Al alloys in 1atm of pure O2 at 800–900°C. Corrosion Science 47, p.1493–1505, 2005.

. SRINIVAS,V.; BARUA,P.; GHOSH,T.B.; MURTY,B.S. Oxidation behavior of Al–Cu–Fe nanoquasicrystal powders. Journal of Non-Crystalline Solids 334 & 335, p.540–543, 2004.

. CABIBIL, H.; KELBER, J.A. Oxidation of S at Fe metal and oxide surfaces and interfaces, Surf. Sci. 373,p. 257–274,1997.

. ZHOU, C.; DUBOIS, J. M.; THIEL, P. A. Formation and Oxidation Behavior of AlCuFe Quasicrystal, J. Mater. Sci. Technol., Vol.18, No.3, p. 251 – 253,2002.

. PINHERO,P.J.; ANDEREGG,J.W.; SORDELET,D.J.; LOGRASSO,T.A.;

DELANEY,D.W.; THIEL,P.A.Surface oxidation of a quasicrystalline Al–Cu–Fe alloy: No effect of surface orientation and grain boundaries on the final state. J. Mater. Res., Vol. 14, No.8, p.3185-3188, Aug 1999.

. DUBOIS, J.M., JEEVAN, H. S., RANGANATHAN, S. Quasicrystals, Ed. S. Takeuchi & T. Fujiwara, (Singapore: World Science),1998.

.CHEVRIER, J.; CAPELLO, G.; COMIN, F.; PALMARI, J.P. New Horizons in Quasicrystals: Research and Applications, edited by A.I.Goldman, D.J. Sordelet, P.A. Thiel, J.M. Dubois, (Singapore: World Scientific), p.114, 1997.

. TURQUIER, F.; STIR, M.; LATHE, C. Phase diagram of AlCuFe quasicrystal forming alloy, Rev. Adv. Mater. Sc. 13, p. 140 – 144,2003.

. NASCIMENTO, L.; AGOSTINHO, L.C. L; CAVALCANTI, B. F. Thermodynamic study of iron in alloys of quasicrystalline AlCuFe. Journal of the Chilean Chemical Society

(Online), v. 58, p. 1609-1613, 2013.