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Advances in Materials Science and Engineering
Volume 2014 (2014), Article ID 476079, 6 pages
Research Article

Reactivity and Microstructure of Al2O3-Reinforced Magnesium-Matrix Composites

1Groupe de Physique des Matériaux (GPM), Avenue de L’Université, B.P. 12, 76801 Saint Étienne du Rouvray, France
2Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
3Helmholtz-Zentrum Geesthacht, Zentrum für Material- und Küstenforschung GmbH, Max-Planck-Straße, 21502 Geesthacht, Germany

Received 20 June 2014; Accepted 10 August 2014; Published 10 September 2014

Academic Editor: Kamineni Pitcheswara Rao

Copyright © 2014 Maher Mounib et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Performances of metal matrix composites (MMCs) rely strongly on the distribution of particles within the metal matrix but also on the chemical reaction which may occur at the liquid-solid interfaces. This paper presents the chemical reaction between aluminum based particles Al2O3 and Al2O3-AlOOH with magnesium alloys matrixes AZ91 and EL21, respectively, and studies the microstructure of these reinforced composites. Different methods such as transmission electron microscopy (TEM), differential scanning calorimetry (DSC), and XRD were used to highlight these chemical reactions and to identify products. Results demonstrate the formation of MgO particles within the matrix for both composites and also the dissolution of aluminum in the eutectic region in the case of EL21.