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Corrosion behaviour of Al/Al3Ti and Al/Al3Zr functionally graded materials prod...
Ferreira, S. C.; Rocha, L. A.; Ariza, E.; Sequeira, P. D.; Watanabe, Yoshimi; Fernandes, J.C.S.Intermetallic particles, Al3Ti and Al3Zr were formed in Al–5mass%Ti and Al–5mass%Zr alloys, respectively, by centrifugal casting, in order to create functionally graded materials (FGMs). At present, no information is available on the influence of the amount of intermetallics on the electrochemical properties of these alloys. In this paper, the corrosion resistance of Al/Al3Ti and Al/Al3Zr FGMs was investigated...
Microstructure characterization of aluminium syntactic functionally graded comp...
Ferreira, S. C.; Velhinho, A.; Rocha, L. A.; Fernandes, F. M. BrazSyntactic functionally graded metal matrix composites (SFGMMC) are a class of metallic foams in which closed porosity results from the presence of hollow ceramic microspheres (microballoons), whose spatial distribution varies continuously between the inner and the outer section of the part, thus resulting in a continuous variation in properties. In this work, aluminium-based SFGMMC rings were fabricated by radi...
Tribocorrosion behaviour of ZrOxNy thin films for decorative applications
Ferreira, S. C.; Ariza, E.; Rocha, L. A.The aim of this work is the investigation of the tribocorrosion behaviour of single layered zirconium oxynitride, ZrOxNy, thin films in 11 reciprocating sliding and immersed in an artificial sweat solution at room temperature. During the wear tests samples were kept under 12 potentiostatic control and the corrosion current were monitored. Also, Electrochemical Impedance Spectroscopy (EIS) tests were performed b...
Wear, corrosion and tribocorrosion behavior of al-based composites reinforced w...
Ferreira, S. C.Dissertação de Mestrado em Processamento e Caracterização de Metais ; The objective of this research work was to study the degradation (corrosion and tribocorrosion) resulting from mechanical (wear) and electrochemistry (corrosion) interactions in Al/Al3Ti and Al/Al3Zr functionally graded materials (FGMs). The influence of the spatial distribution of the platelets on the corrosion and tribocorrosion behaviour ...
Application of X-ray microtomography to the microstructural characterization of...
Velhinho, A.; Fernandes, F. M. Braz; Ferreira, S. C.; Rocha, L. A.; Vignoles, G.; Cloetens, P.This paper provides a brief overview of the possibilities offered by X-ray computed microtomography, and particularly synchrotron radiation X-ray microtomography, regarding metal matrix composite characterization, emphasis being placed in the case of Al-based functionally graded materials. Examples are provided concerning the characterization of the reinforcement population, interfacial properties, in-situ tran...
Tribocorrosion behaviour of zrNxOy thin films for decorative applications
Ferreira, S. C.; Ariza, E.; Rocha, L. A.; Vaz, F.; Cunha, L.; Carvalho, P.; Rebouta, L.; Alves, E.; Goudeau, Ph.; Rivière, J. P.The main aim of this work is the investigation of the tribocorrosion behaviour of single layered zirconium oxynitride, ZrNxOy, thin films in alternative linear regime of sliding and immersed in an artificial sweat solution at room temperature. The films were produced by rf reactive magnetron sputtering, using a pure Zr target at a constant temperature of 300º C. Two different sets of samples were produced. In t...
Corrosion behaviour of single layered ZrNxOy thin films in artificial sweat sol...
Ariza, E.; Rocha, L. A.; Ferreira, S. C.; Vaz, F.; Cunha, L.; Carvalho, P.; Rebouta, L.; Alves, E.; Goudeau, Ph.; Rivière, J. P.Applications of coloured thin films can be found on the production of high-quality consumer products, such as eyeglass frames, wristwatch casings and wristbands. These components should possess scratch and corrosion resistant surfaces through the desired lifetime. Recently, metal oxynitrides, MeNxOy (Me = early transition metal) were proposed for decorative applications. In these materials, variations on the am...
Corrosion resistance of ZrNxOy thin films obtained by rf reactive magnetron spu...
Ariza, E.; Rocha, L. A.; Vaz, F.; Cunha, L.; Ferreira, S. C.; Carvalho, P.; Rebouta, L.; Alves, E.; Goudeau, Ph.; Rivière, J. P.The main aim of this work is the investigation of the corrosion resistance of single layered zirconium oxynitride, ZrNxOy, thin films in artificial sweat solution at ambient emperature. The films were produced by rf reactive magnetron sputtering, using a pure Zr target at a constant temperature of 300 8C. Two different sets of samples were produced. In the first set of films, the substrate bias voltage was the ...
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