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Sulfur Segregation to Al2O3–FeAl Interfaces Studied by Field Emission-Auger Electron Spectroscopy

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Abstract

Using a 30-nm field-emission Auger spectroscopy probe, the segregation of sulfur to a growing oxide–metal interface was studied. The interfaces were formed by the oxidation of a Fe–40at.% Al alloy at 1000°C for various times. Both the oxide and the alloy sides of the interface were examined after spalling the surface Al2O3 layer in ultra-high vacuum. Results were compared with similar studies performed using conventional AES and related to scale development and the interface microstructure. Sulfur started to segregate to the interface only after a complete layer of α-Al2O3 developed there, its concentration then increased slowly with further oxidation until reaching a level close to half a monolayer. Higher amounts were observed on interfacial-void surfaces, where Al and S cosegregated. The study showed that sulfur segregation to oxide–alloy interfaces depended on the type of interface, indicating possible relationships between segregation energies and interface microstructure.

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Authors and Affiliations

  1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California, 94720

    P.Y. Hou

  2. Charles Evans and Associates, Sunnyvale, California, 94086

    J. Moskito

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  1. P.Y. Hou
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Hou, P., Moskito, J. Sulfur Segregation to Al2O3–FeAl Interfaces Studied by Field Emission-Auger Electron Spectroscopy. Oxidation of Metals 59, 559–574 (2003). https://doi.org/10.1023/A:1023627424723

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