Local Strain Accommodation in Polycrystalline Ni-Base Superalloys

  • Jennifer Walley
  • Robert Wheeler
  • Michael D. Uchic
  • Michael J. Mills
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)


To exploit new hybrid nickel-based superalloys, physics-based computational models are needed to predict material properties and describe material behavior during exposure to complex life cycles. Such models will allow an iterative assessment of microstructural morphology as related to mechanical properties prior to production of large-scale test specimens or components, thereby reducing development time and cost. Development of these models is currently hindered by a gap in the understanding of local deformation behavior at the intra- and intergranular level. A new in-situ experimental methodology is being developed to characterize local strain heterogeneities in nickel-based superalloys that have a relatively fine grain size (dave<50μm). Initial work has been performed on Rene 104 that was heat treated to produce two sets of samples with a similar grain size but different γ’ distributions and grain boundary morphologies. One sample set had planar boundaries and a bimodal γ’ distribution, the other set had serrated boundaries and a trimodal γ’ distribution. Progress has been made towards implementation of a suitable speckle pattern for digital image correlation (DIC). Quasi-isostatic room temperature tensile tests were performed in a scanning electron microscope, with images acquired at regular strain intervals. This preliminary data was qualitatively analyzed using Correlated Solutions VIC-2D software. The data for the serrated boundaries indicates that there are indeed interesting strain heterogeneities being developed that are related to grain orientations, boundary relationships to the tensile axis and other boundaries.


Digital Image Correlation Standard Heat Treatment Scanning Electron Microscopy Backscatter Boundary Triple Point Microhardness Indent 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    J. Gayda, et al., The Effect of Dual Microstructure Heat Treatment on an Advanced Nickel-Base Disk Alloy, in Superalloys, pp.323-329, (2004).Google Scholar
  2. 2.
    D. P. Mourer, et al., Dual Alloy Disk Development, in Superalloys, pp.637-643, (1996).Google Scholar
  3. 3.
    D. P. Mourer and J. L. Williams, Dual Heat Treat Process Development for Advanced Disk Applications in Superalloys, pp.401-407, (2004).Google Scholar
  4. 4.
    R. C. Reed, The Superalloys: Fundamentals and Applications, Cambridge University Press, (2006).Google Scholar
  5. 5.
    H. L. Danflou, et al., Mechanisms of Formation of Serrated Grain Boundaries in Nickel Base Superalloys, in Superalloys 1996, pp.119-127, (1996).Google Scholar
  6. 6.
    H. L. Danflou, et al., Formation of Serrated Grain Boundaries and Their Effect on the Mechanical Properties in a P/M Base Superalloy, in Superalloys 1992, pp.63-72, (1992).Google Scholar
  7. 7.
    E. J. Payton, Characterization and Modeling of Grain Coarsening in Powder Metallurgical Nickel-Based Superalloys, PhD Thesis, The Ohio State University, (2009)Google Scholar
  8. 8.
    ASTM committee E04.08, ASTM E112-Standard Test Methods for Determining Average Grain Size, in ASTM Standards, pp.1-26, (1996).Google Scholar
  9. 9.
    E. J. Payton, et al., Semi-automated Characterization of the gamma prime phase in Ni-based superalloys via high-resolution backscatter imaging, in Mat. Sci. and Eng. A, Vol. 527 pp. 2684–92, (2009)CrossRefGoogle Scholar
  10. 10.
    W. A. Scrivens, et al., Development of Patterns for Digital Image Correlation Measurements at Reduced Length Scales, in Experimental Mechanics, Vol. 47 (1), pp. 63–77, (2007)Google Scholar
  11. 11.
    M. A. Sutton, et al., Image Correlation for Shape, Motion and Deformation Measurements, Springer, (2009).Google Scholar
  12. 12.
    C. Zheng, Nanofabrication: Principles, Capabilities and Limits, Springer Inc., (2008).Google Scholar
  13. 13.
    I. M. Fielden, Investigation of Microsctural Evolution by Real-Time SEM of High-Temperature Specimens, Sheffield Hallam University (2005)Google Scholar
  14. 14.
    G. G. E. Seward, et al., High-temperature electron backscatter diffraction and scanning electron microscopy imaging techniques: In-situ investigations of dynamic processes, in Scanning, Vol. 24 pp. 232–240, (2002)Google Scholar
  15. 15.
    M. A. Sutton, et al., Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements - Part II: Experimental Validation for Magnifications from 200 to 10,000, in Experimental Mechanics, Vol. 47 (6), pp. 789–804, (2007)MathSciNetGoogle Scholar
  16. 16.
    M. A. Sutton, et al., Scanning Electron Microscopy for Quantitative Small and Large Deformation Measurements - Part I: SEM Imaging at Magnifications from 200 to 10,000, in Experimental Mechanics, Vol. 47 (6), pp. 775–787, (2007)MathSciNetGoogle Scholar
  17. 17.
    M. A. Tschopp, et al., Microstructure-Dependent Local Stain Behavior in Polycrystals Through In-Situ Scanning Electron Microscope Tensile Experiments, in Met. Mat. Trans. A, Vol. 40A pp. 2363–68, (2009)CrossRefGoogle Scholar
  18. 18.
    A. Soula, et al., Grain boundary and intragranular deformations during high temperature creep of PM Ni-based superalloys, in Superalloys 2008, pp.387-93, (2008).Google Scholar
  19. 19.
    R. C. Gifkins, The Measurement of Grain-Boundary Sliding in Polycrystalline Specimens, in Metal Sci. J., Vol. 7 pp. 15–19, (1973)Google Scholar

Copyright information

© Springer Science+Business Media, LLC 2011

Authors and Affiliations

  • Jennifer Walley
    • 1
  • Robert Wheeler
    • 2
  • Michael D. Uchic
    • 3
  • Michael J. Mills
    • 4
  1. 1.The Ohio State UniversityColumbusUSA
  2. 2.UES, Inc.DaytonUSA
  3. 3.Air Force Research Laboratory, Materials & Manufacturing DirectorateAFRL/RXLM, Wright Patterson AFBDaytonUSA
  4. 4.The Ohio State UniversityColumbusUSA

Personalised recommendations