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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...
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...
Evaluation of SiC-particle connectivity in functionally graded Al/SiCp composit...
Velhinho, A.; Vignoles, G.; Cloetens, P.; Thibault, X.; Boller, E.; Fernandes, F. M. Braz; Rocha, L. A.; Botas, J. D.Reliability of functionally graded metal matrix composites (FGMMCs) for automotive components is still dependent on the detailed knowledge of the mechanisms of the microstructural build-up, for instance on the mechanisms leading to the distribution and relative positions of the reinforcing particles. In order to assess the influence of the SiC particle size on the 3-D inter-particle connectivity in functionally...
Tribocorrosion studies in centrifugally cast al-matrix siCp-reinforced function...
Velhinho, A.; Botas, J. D.; Ariza, E.; Gomes, J. R.; Rocha, L. A.The present work reports results obtained from a series of preliminary experiments aiming at complementing the current knowledge about the wear behaviour of centrifugally-cast FGM Al/SiCp composites, through concurrent corrosion processes. Precursor MMC’s were prepared by rheocasting, using 118.8 µm SiC particles and an Al-10Si–2.2 Mg alloy. Those MMC’s were then molten and centrifugally cast in order to produc...
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