Phase-oriented surface segregation in an aluminium casting alloy

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Date
2009-02-15
Journal Title
Journal ISSN
Volume Title
Publisher
Elsevier
Abstract
There have been many reports of the surface segregation of minor elements, especially Mg, into surface layers and oxide films on the surface of Al alloys. LM6 casting alloy (Al–12%Si) represents a challenging system to examine such segregation as the alloy features a particularly inhomogeneous phase structure. The very low but mobile Mg content (approximately 0.001 wt.%), and the surface segregation of modifiers such as Na, mean the surface composition responds in a complex manner to thermal treatment conditions. X-ray photoelectron spectroscopy (XPS) has been used to determine the distribution of these elements within the oxide film. Further investigation by dynamic secondary ion mass spectrometry (DSIMS) confirmed a strong alignment of segregated Na and Mg into distinct phases of the structure. © 2009, Elsevier Ltd.
Description
Keywords
Aluminium alloys, Casting, Segregation, Surfaces, X-ray photoelectron spectroscopy, Magnesium, Mass spectroscopy
Citation
Nguyen, C. L., Atanacio, A., Zhang, W., Prince, K. E., Hyland, M. M., & Metson, J. B. (2009). Phase-oriented surface segregation in an aluminium casting alloy. Applied Surface Science, 255(9), 4880-4885. doi:10.1016/j.apsusc.2008.12.025
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