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Sulfur Segregation at Al2O3/γ-Νi + γ′-Ni3Al Interfaces: Effects of Pt, Cr and Hf Additions

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Abstract

The interfacial chemistry that developed as a result Al2O3-scale growth on γ-Νi + γ′-Ni3Al alloys at 1150 °C was studied using scanning Auger microscopy after the oxide layer was scratched to spall under ultra-high vacuum. The extent of scale spallation was used to evaluate semi-quantitatively the interfacial strength. The alloys investigated were primarily γ′ in structure, containing 22 at.% Al plus further additions of Pt, Cr and/or Hf. In the case of the binary γ + γ′ alloy, it was found that a sub-monolayer of sulfur segregated at the alloy/scale interface. Platinum reduced and hafnium eliminated sulfur segregation, but chromium enhanced it through Cr–S co-segregation, even on Pt- and Hf-containing alloys. Platinum also segregated slightly at the alloy/scale interface. The interface strength was a strong function of the sulfur content. Beyond the effect of eliminating S segregation, Pt and Hf both showed additional beneficial effects on alumina scale adhesion.

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Acknowledgment

Portions of this work were performed at the Molecular Foundry, Lawrence Berkeley National Laboratory, which is supported by the Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under Contract DE-AC02-05CH11231. Research at LBNL was sponsored by the above DOE office under contract DE-AC02-06CH11357 and by the Air Force Office of Sponsored Research under the MEANS-2 Program (Grant No. FA9550-05-1-0173). Research at Iowa State was supported by the Office of Naval Research under contract N00014-07-1-0122, with Dr. David Shifler being the Program Manager.

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Author notes

  1. T. Izumi

    Present address: Hitachi, Ltd, Ibaraki, Japan

  2. B. Gleeson

    Present address: Department of Mechanical Engineering and Materials Science, University of Pittsburgh, Pittsburgh, PA, USA

Authors and Affiliations

  1. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA, 94720, USA

    P. Y. Hou

  2. Iowa State University, Ames, IA, USA

    T. Izumi & B. Gleeson

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  1. P. Y. Hou
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  2. T. Izumi
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  3. B. Gleeson
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Correspondence to P. Y. Hou.

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Hou, P.Y., Izumi, T. & Gleeson, B. Sulfur Segregation at Al2O3/γ-Νi + γ′-Ni3Al Interfaces: Effects of Pt, Cr and Hf Additions. Oxid Met 72, 109–124 (2009). https://doi.org/10.1007/s11085-009-9149-y

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  • DOI: https://doi.org/10.1007/s11085-009-9149-y

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