Evaluation of SiC-particle connectivity in functionally graded Al/SiC p composites by synchrotron radiation holographic microtomography

A. Velhinho, G. L. Vignoles, P. Cloetens, X. Thibault, E. Boller, F. Braz Fernandes, L. A. Rocha, J. D. Botas

Research output: Chapter in Book/Report/Conference proceedingConference contribution

2 Citations (Scopus)

Abstract

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 graded Al/SiCp composites produced by centrifugal casting, X-ray microtomography experiments were performed at the ID19 beamline in ESRF (European Synchrotron Radiation Facility). The FGMMCs consisted of an Al-10Si-2Mg alloy matrix, reinforced by an average SiC particle volume fraction of 0.10; two different average sizes were used: 37 μm and 12 μm. The holographic modification of the X-ray CMT (Computer Micro-Tomography) method allowed to obtain neatly contrasted images, as opposed to classical CMT.Good agreement was found between the particle size evaluated by CMT and by laser interferometry. Particle clustering has been evaluated in number and volume, showing that a lower mean particle size is related to more clustering. Such an adverse effect relies on the importance of particle/liquid alloy surface tension. Also, the mean particle size has been evaluated as a function of particle number within a cluster: as expected, the larger a cluster, the larger the particles inside it.

Original languageEnglish
Title of host publicationFunctionally Graded Materials VIII, FGM2004 - Proceedings of the 8th International Symposium on Multifunctional and Functionally Graded Materials, (FGM2004)
EditorsO. VanderBiest, M. Gasik, J. Vleugels
PublisherTrans Tech Publications Ltd
Pages621-626
Number of pages6
ISBN (Print)0878499709, 9780878499700
DOIs
Publication statusPublished - 1 Dec 2005
Event8th International Symposium on Multifunctional and Functionally Graded Materials, FGM2004 - Leuven, Belgium
Duration: 11 Jul 200414 Jul 2004

Publication series

NameMaterials Science Forum
PublisherTrans Tech Publications Ltd
Volume492-493
ISSN (Print)0255-5476

Conference

Conference8th International Symposium on Multifunctional and Functionally Graded Materials, FGM2004
CountryBelgium
CityLeuven
Period11/07/0414/07/04

Keywords

  • FGMMC
  • Holotomography
  • Microtomography
  • MMC
  • Particle connectivity
  • Synchrotron radiation

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    Velhinho, A., Vignoles, G. L., Cloetens, P., Thibault, X., Boller, E., Fernandes, F. B., ... Botas, J. D. (2005). Evaluation of SiC-particle connectivity in functionally graded Al/SiC p composites by synchrotron radiation holographic microtomography. In O. VanderBiest, M. Gasik, & J. Vleugels (Eds.), Functionally Graded Materials VIII, FGM2004 - Proceedings of the 8th International Symposium on Multifunctional and Functionally Graded Materials, (FGM2004) (pp. 621-626). (Materials Science Forum; Vol. 492-493). Trans Tech Publications Ltd. https://doi.org/10.4028/www.scientific.net/MSF.492-493.621