An XPS analysis of the oxide surface layers formed on a friction stir processed magnesium alloy

Friction stir processing (FSP) is a promising technique for improving plasticity of magnesium alloys through the homogenization and grain refinement of their structure. In this study, a magnesium alloy AZ31 has been processed by FSP to achieve an ultrafine grain size structure (700 nm), and the oxid...

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Bibliographic Details
Published in:Surface and interface analysis 2012-08, Vol.44 (8), p.1030-1034
Main Authors: Cristóbal, M. J., Gesto, D., Miniño, P., Pena, G., Rey, P., Verdera, D.
Format: Article
Language:English
Subjects:
AZ31
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
FSP
Mg alloys
Physics
surface oxide
XPS
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Summary:Friction stir processing (FSP) is a promising technique for improving plasticity of magnesium alloys through the homogenization and grain refinement of their structure. In this study, a magnesium alloy AZ31 has been processed by FSP to achieve an ultrafine grain size structure (700 nm), and the oxide films formed spontaneously on the surface of the FSP zone are compared with those on the unprocessed material. Chemical composition of the oxide films are analyzed by XPS. The natural oxide films, close to 36 nm, can be described as a structure of (MgO)/Mg(OH)2 with the outermost surface mainly formed by Mg(OH)2/MgCO3. About 5–7 at.% of Al3+ is distributed through the oxide layer. Segregated zinc enrichment (Zn 2p3/2 at 1021.4 eV) at the interface oxide/metal is found. The FSP samples show higher carbonatation degree at the surface and a lower segregated zinc percentage at the interface oxide/metal. Copyright © 2012 John Wiley & Sons, Ltd.
ISSN:0142-2421
1096-9918
DOI:10.1002/sia.4859