Oxidation of Metals

, Volume 73, Issue 1, pp 219–232

High Temperature Oxidation of the Al3Mg2 Complex Metallic Alloy

  • M.-N. de Noirfontaine
  • G. Baldinozzi
  • M.-G. Barthés-Labrousse
  • J. Kusinski
  • G. Boëmare
  • M. Herinx
  • M. Feuerbacher
Original paper

DOI: 10.1007/s11085-009-9176-8

Cite this article as:
de Noirfontaine, MN., Baldinozzi, G., Barthés-Labrousse, MG. et al. Oxid Met (2010) 73: 219. doi:10.1007/s11085-009-9176-8
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Abstract

High temperature air oxidation of the Al3Mg2 complex metallic alloy was investigated on powder samples and bulk polycrystals in the temperature range 350–420 °C by thermogravimetric measurements, SEM and TEM. Oxidation at 420 °C on the polycrystalline samples comprised three successive phases characterised by linear kinetics laws. The first stage corresponded to the formation of a porous non adherent nanocrystalline MgO scale having a cauliflower morphology. A first acceleration in the kinetics law was ascribed to the nucleation and growth of MgAl2O4 crystallites which form a thin (~10 nm) film at the interface between the substrate alloy and the MgO top layer. A new linear regime was observed in the oxidation process corresponding to diffusion of magnesium through the grain boundaries of the spinel film and through the porous MgO layer. Finally, fragmentation and cracking of the scale leads to a further acceleration followed by a new linear regime.

Keywords

Al3Mg2Complex metallic alloysIntermetallicsAluminium alloysOxidation kineticsThermogravimetric analysis

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • M.-N. de Noirfontaine
    • 1
    • 2
  • G. Baldinozzi
    • 3
  • M.-G. Barthés-Labrousse
    • 1
    • 4
  • J. Kusinski
    • 5
  • G. Boëmare
    • 3
  • M. Herinx
    • 1
    • 4
  • M. Feuerbacher
    • 6
  1. 1.Centre d’Etudes de Chimie Métallurgique, CNRS UPR 2801Vitry CedexFrance
  2. 2.Laboratoire des Solides Irradiés, CNRS UMR 7642Ecole PolytechniquePalaiseauFrance
  3. 3.Structures, Propriétés et Modélisation des Solides, CNRS UMR 8580Ecole Centrale ParisChâtenay-MalabryFrance
  4. 4.Laboratoire d’Etude des Matériaux Hors Equilibre, CNRS UMR 8182Institut de Chimie Moléculaire et des Matériaux d’OrsayOrsay CedexFrance
  5. 5.Department of Surface Engineering and Materials CharacterizationAGHKrakowPoland
  6. 6.Institut für MikrostrukturforschungForschungszentrum Jülich GmbHJülichGermany