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Phase Transformation Behavior of Al2O3 Scale Formed on Pt-Modified γ′-Ni3Al-Based Alloys With and Without Hf Addition

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Abstract

The allotropic phase transformation behavior of Al2O3 scale formed on Ni–22Al–30Pt (in at.%) with and without 0.5Hf was investigated during short-term (i.e., 3 min dwell) cyclic oxidation at 1,150 °C in air. Hafnium addition did not appear to affect the oxidation rate in the early oxidation cycles, but it did delay the phase transformation from the metastable θ-Al2O3 structure to the stable α-Al2O3. Small dimples, which corresponded to α-Al2O3 grains, started to form on the Hf-free alloy after only three oxidation cycles; whereas, no apparent morphological change of the oxide scale surface was observed on the Hf-modified alloy. The transformation to α-Al2O3 was found to initiate at scale/alloy interface on the Hf-free alloy, but it initiated at gas/scale interface on the Hf-modified alloy. Depth profiling using glow discharge optical emission spectroscopy revealed that Hf enriched at the scale/alloy interface due to Hf rejection associated with the formation of an Al-depleted γ-layer, which has a low Hf solubility. Higher positive strain energy due to Hf solution in the metastable Al2O3 was inferred to be the main contributor to the delayed the transformation.

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Acknowledgments

Partial support for this work was provided by the Office of Naval Research, contract number N000140911127, with Dr. David Shifler being the Program Manager.

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Authors and Affiliations

  1. Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, N13, W8, Kitaku, Sapporo, Hokkaido, 060-8628, Japan

    Shigenari Hayashi

  2. Department of Mechanical Engineering & Materials Science, University of Pittsburgh, Pittsburgh, PA, 15261, USA

    Brian Gleeson

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  1. Shigenari Hayashi
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  2. Brian Gleeson
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Correspondence to Shigenari Hayashi.

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Hayashi, S., Gleeson, B. Phase Transformation Behavior of Al2O3 Scale Formed on Pt-Modified γ′-Ni3Al-Based Alloys With and Without Hf Addition. Oxid Met 77, 237–251 (2012). https://doi.org/10.1007/s11085-012-9282-x

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  • DOI: https://doi.org/10.1007/s11085-012-9282-x

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