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Influence of Aluminum and Rhenium on the Isothermal Oxidation Behavior of CoNiCrAlY Alloys

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Abstract

The oxidation behavior of a Co32Ni21Cr8Al0.6Y (wt%) alloy with and without the addition of 3.5 wt% rhenium, 2 wt% aluminum or a combination of the two was investigated at 1000 °C. Results showed that increasing the Al content from 8 to 10 wt% led to an increase of the alloy β-phase, but did not affect the oxidation behavior. Re addition induced (Cr,Re,Y)-rich phase to precipitate in the alloy, accelerated the θ- to α-alumina transformation, reduced the oxidation rate and enhanced the rate of alloy Al diffusion. Adding both Al and Re further improved the oxidation behavior by promoting the development of the external alumina scale and suppressing the formation of Ni, Co containing spinel. This alloy also showed the largest reduction of oxidation rate and emerged to be the most beneficial. A continuous Cr–Re rich layer was observed at the oxide/alloy interface of the Re, Al containing alloy after longer oxidation times, but this layer is not expected to affect the continued growth of the alumina scale.

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Acknowledgment

The authors gratefully acknowledge the support of Mitsubishi Heavy Industries (MHI) of Japan.

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Authors and Affiliations

  1. State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China

    H. Lan, Z.-G. Yang, Y.-D. Zhang & C. Zhang

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

    P. Y. Hou

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  1. H. Lan
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  2. P. Y. Hou
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  3. Z.-G. Yang
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  4. Y.-D. Zhang
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  5. C. Zhang
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Correspondence to Z.-G. Yang.

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Lan, H., Hou, P.Y., Yang, ZG. et al. Influence of Aluminum and Rhenium on the Isothermal Oxidation Behavior of CoNiCrAlY Alloys. Oxid Met 75, 77–92 (2011). https://doi.org/10.1007/s11085-010-9221-7

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  • DOI: https://doi.org/10.1007/s11085-010-9221-7

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