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High refractory, low misfit ru-containing single-crystal superalloys

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Abstract

Single-crystal Ru-containing nickel-base superalloys with spherical γ′ precipitates have been observed in alloys with substantial amounts of Re and W and high levels of Ru. The γ′ precipitates did not experience stress-induced shape changes (rafting) during creep deformation at 950 °C and 290 MPa, indicative of a γ-γ′ lattice misfit very near zero. Furthermore, interfacial dislocation networks were not formed during creep deformation in the low misfit alloys. The alloys containing spherical precipitates had lower creep strengths than the alloys containing cuboidal precipitates at 950 °C and 290 MPa. Element partitioning between the phases was investigated in order to determine the origin of the unusual microstructural features. Transmission electron microscopy (TEM)-based energy-dispersive spectroscopy (EDS) analysis of the γ and γ′ phases indicates that Ru affects the partitioning of Re, which partitions much less strongly to the matrix than previously observed in Re-containing superalloys, consistent with a lattice misfit very near zero. With high levels of Ru, the addition of Cr also has a strong influence on partitioning. These investigations demonstrate that Ru and Cr control the lattice misfit, precipitate shape, and creep behavior, through the associated changes in the γ-γ′ phase equilibrium.

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Author notes

  1. Q. Feng (Senior Research Fellow, Professor)

    Present address: Materials Science and Engineering Department, University of Michigan, 48109, Ann Arbor, MI

Authors and Affiliations

  1. GE Aviation, USA

    L. J. Carroll (Lead Engineer)

  2. Key Laboratory for Advanced Metals and Materials, University of Science and Technology, Beijing, 100083, Beijing, People’s Republic of China

    Q. Feng (Senior Research Fellow, Professor)

  3. Materials Science and Engineering Department, University of Michigan, 48109, Ann Arbor, MI

    J. F. Mansfield (Associate Research Scientist) & T. M. Pollock (L.H. and F.E. Van Vlack Professor)

Authors
  1. L. J. Carroll
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  2. Q. Feng
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  3. J. F. Mansfield
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  4. T. M. Pollock
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Carroll, L.J., Feng, Q., Mansfield, J.F. et al. High refractory, low misfit ru-containing single-crystal superalloys. Metall Mater Trans A 37, 2927–2938 (2006). https://doi.org/10.1007/s11661-006-0174-z

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  • DOI: https://doi.org/10.1007/s11661-006-0174-z

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