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

  • T. M. Smith
  • B. D. Esser
  • B. Good
  • M. S. Hooshmand
  • G. B. Viswanathan
  • C. M. F. Rae
  • M. Ghazisaeidi
  • D. W. McComb
  • M. J. Mills
Topical Collection: Superalloys and Their Applications
  • 872 Downloads
Part of the following topical collections:
  1. Third European Symposium on Superalloys and their Applications

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.

Notes

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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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2018

Authors and Affiliations

  • T. M. Smith
    • 1
  • B. D. Esser
    • 2
  • B. Good
    • 1
  • M. S. Hooshmand
    • 2
  • G. B. Viswanathan
    • 2
  • C. M. F. Rae
    • 3
  • M. Ghazisaeidi
    • 2
  • D. W. McComb
    • 2
  • M. J. Mills
    • 2
  1. 1.NASA Glenn Research CenterClevelandUSA
  2. 2.Center for Electron Microscopy and AnalysisThe Ohio State UniversityColumbusUSA
  3. 3.Department of Materials Science and MetallurgyUniversity of CambridgeCambridgeUK

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