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Journal of Materials Science

, Volume 43, Issue 10, pp 3452–3458 | Cite as

Thermal stability and oxidation behavior of Al-containing nanocrystalline powders produced by cryomilling

  • A. Almathami
  • E. Elhachmi
  • M. BrochuEmail author
NanoSmat 2007 - International Conference on Surfaces, Coatings and Nanostructured Materials

Abstract

Al-containing nanostructured coatings provide excellent protection from high temperature corrosion. Aluminum oxide scales generally provide better oxidation resistance and yield lower oxidation rates than other oxide scale compositions. In this study, nanocrystalline 316L stainless steel containing 6 wt.% Al was synthesized using cryogenic milling (cryomilling). Complete alloying was obtained after 32 h of milling and the average grain size was found to be 7 nm. High temperature thermal stability and oxidation kinetics of the alloyed powders were examined. The powder demonstrated good grain growth stability at 500 °C, at which point, the powders had been heat treated for 120 h and the average grain size was found to be 11.4 nm. The oxidation kinetics of the powder were studied for 48 h at 500, 800, and 1,000 °C, respectively. For comparison, conventional 316LSS powder was also tested. Nanocrystalline 316LSS-6 wt.% Al showed lower weight gain than the conventional 316LSS powders. During the oxidation of nanocrystalline 316LSS-6 wt. % Al at 500 °C, protective aluminum oxide scale formed at the surface. At 800 °C and 1,000 °C, most of the nanocrystalline 316LSS-6 wt.% Al particles showed completed outer aluminum oxide scale. However, at 800 and 1,000 °C, some particles showed growth of chromium oxide scale underneath the aluminum oxide scale. In those samples, Al depletion was also observed due to a non-homogenous distribution of Al during cryomilling. The activation energy of the oxidation reaction was calculated and was found to be affected by the enhancement of the grain boundary diffusion in nanostructured particles.

Keywords

Oxide Scale Tube Bundle Aluminum Oxide Scale High Temperature Corrosion Nanocrystalline Powder 

Notes

Acknowledgements

The authors would like to acknowledge Saudi Aramco Company, which generously awarded financial support to A. Almathami. The authors would also like to thank McGill University and Hoganas for providing the starting powders.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  1. 1.Department of Mining and Materials EngineeringMcGill UniversityMontrealCanada
  2. 2.Materials Technology LaboratoryNatural Resources CanadaOttawaCanada

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