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Effects of Ru on the high-temperature phase stability of Ni-base single-crystal superalloys

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Abstract

Microstructural instabilities associated with the precipitation of refractory-rich topologically-close-packed (TCP) phases within the microstructure of advanced Ni-base single-crystal superalloys were quantified in two nominally identical alloys with and without additions of Ru. Differences in the microstructural kinetics associated with the formation of TCP precipitates in these experimental single-crystal superalloys enabled the influence of Ru to be assessed. Detailed microstructural investigations were carried out on specimens subjected to prolonged isothermal exposures at elevated temperature. Even after 1000 hours at temperatures in excess of 1100 °C, the microstructure of the Ru-bearing alloy was highly resistant to the formation of TCP phases. Transmission electron micro-analysis (TEM) coupled with X-ray diffraction (XRD) was used to identify the characteristic crystal structures of the TCP precipitates in both alloys as being primarily the orthorhombic P and tetragonal σ phase. The sluggish precipitation kinetics of TCP phases in the Ru-bearing single-crystal Ni-base superalloy prevents the breakdown of the parent γ-γ′ microstructure and greatly enhances the high-temperature creep characteristics.

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Author notes

  1. A. C. Yeh (Graduate Researcher, Postdoctoral Researcher)

    Present address: Rolls-Royce University Technology Partnership Materials Science and Metallurgy Department, University of Cambridge, CB2 3QZ, Cambridge, United Kingdom

  2. S. Tin (Assistant Director of Research, Associate Professor)

    Present address: Rolls-Royce University Technology Partnership Materials Science and Metallurgy Department, University of Cambridge, UK

Authors and Affiliations

  1. The National Institute of Materials Science, 305-0047, Tskuba, Japan

    A. C. Yeh (Graduate Researcher, Postdoctoral Researcher)

  2. Illinois Institute of Technology, 60616, Chicago, IL

    S. Tin (Assistant Director of Research, Associate Professor)

Authors
  1. A. C. Yeh
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  2. S. Tin
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Yeh, A.C., Tin, S. Effects of Ru on the high-temperature phase stability of Ni-base single-crystal superalloys. Metall Mater Trans A 37, 2621–2631 (2006). https://doi.org/10.1007/BF02586097

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  • DOI: https://doi.org/10.1007/BF02586097

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