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Mechanisms of Topologically Close-Packed Phase Suppression in an Experimental Ruthenium-Bearing Single-Crystal Nickel-Base Superalloy at 1100 °C

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Abstract

Ruthenium (Ru) suppresses the precipitation of deleterious topologically close-packed (TCP) phases in high refractory content single-crystal Ni-base superalloys. The effectiveness of Ru as a TCP suppressant appears to be the net effect of its limited solubility in the TCP phase, a lower density of structural growth ledges for atomic attachment at the TCP/matrix interface, and destabilization of the γ′ phase at elevated temperatures. These characteristics combine to limit the growth rates of precipitates and decrease the driving force for TCP precipitation, which has the secondary effect of reducing the TCP nucleation rate. The reduction in γ′ volume fraction upon the addition of Ru is particularly potent due to the sensitivity of the rhenium (Re) content in the γ matrix to changes in the γ′ volume fraction.

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  2. PHILIPS is a trademark of Philips Electronic Instruments Corp. Mahwah, NJ.

  3. PHILIPS is a trademark of Philips Electronic Instruments Corp. Mahwah, NJ.

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Acknowledgments

The authors gratefully acknowledge Rolls-Royce plc., the Engineering and Physical Sciences Research Council (EPSRC), the Cambridge Commonwealth Trust, and the Worshipful Company of Engineers for the provision of material and funding.

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Authors and Affiliations

  1. Rolls-Royce plc, Derby, DE24 8BJ, United Kingdom

    R.A. Hobbs (Turbine Aerofoil Materials Specialist)

  2. Department of Materials Science & Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, United Kingdom

    L. Zhang (Research Fellow) & C.M.F. Rae (Lecturer)

  3. Department of Mechanical, Materials & Aerospace Engineering, Illinois Institute of Technology, Chicago, IL, 60616, United States

    S. Tin (Associate Professor)

Authors
  1. R.A. Hobbs
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  2. L. Zhang
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  3. C.M.F. Rae
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  4. S. Tin
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Correspondence to R.A. Hobbs.

Additional information

Manuscript submitted July 30, 2007.

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Hobbs, R., Zhang, L., Rae, C. et al. Mechanisms of Topologically Close-Packed Phase Suppression in an Experimental Ruthenium-Bearing Single-Crystal Nickel-Base Superalloy at 1100 °C. Metall Mater Trans A 39, 1014–1025 (2008). https://doi.org/10.1007/s11661-008-9490-9

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