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Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys

  • Topical Collection: Superalloys and Their Applications
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Abstract

In this study, local chemical and structural changes along superlattice intrinsic stacking faults combine to represent an atomic-scale phase transformation. In order to elicit stacking fault shear, creep tests of two different single crystal Ni-based superalloys, ME501 and CMSX-4, were performed near 750 °C using stresses of 552 and 750 MPa, respectively. Through high-resolution scanning transmission electron microscopy (STEM) and state-of-the-art energy dispersive X-ray spectroscopy, ordered compositional changes were measured along SISFs in both alloys. For both instances, the elemental segregation and local crystal structure present along the SISFs are consistent with a nanoscale γ′ to D019 phase transformation. Other notable observations are prominent γ-rich Cottrell atmospheres and new evidence of more complex reordering processes responsible for the formation of these faults. These findings are further supported using density functional theory calculations and high-angle annular dark-field (HAADF)-STEM image simulations.

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Acknowledgments

Funding for this study was provided by NASA’s Aeronautics Research Mission Directorate (ARMD) – Convergent Aeronautics Solutions Project and NASA’s Advanced Air Transport Technology (AATT) Project Office (ARMD). Further funding was provided by the National Science Foundation and the DMREF program under Grant #1534826.

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Authors and Affiliations

  1. NASA Glenn Research Center, 21000 Brookpark Road, Cleveland, OH, 44135, USA

    T. M. Smith & B. Good

  2. Center for Electron Microscopy and Analysis, The Ohio State University, Columbus, OH, 43212, USA

    B. D. Esser, M. S. Hooshmand, G. B. Viswanathan, M. Ghazisaeidi, D. W. McComb & M. J. Mills

  3. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, CB2 3QZ, UK

    C. M. F. Rae

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  1. T. M. Smith
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Correspondence to T. M. Smith.

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Manuscript submitted March 12, 2018.

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Smith, T.M., Esser, B.D., Good, B. et al. Segregation and Phase Transformations Along Superlattice Intrinsic Stacking Faults in Ni-Based Superalloys. Metall Mater Trans A 49, 4186–4198 (2018). https://doi.org/10.1007/s11661-018-4701-5

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