Micro-strain and cyclic slip accumulation in a polycrystalline nickel-based superalloy

R. L. Black, D. Anjaria, J. Genée, V. Valle, J. C. Stinville

Research output: Contribution to journalArticlepeer-review


This work provides a comprehensive characterization and analysis of deformation and fatigue damage mechanisms in a nickel-based superalloy during ambient temperature fatigue and points to a fundamental deformation mechanism that results in the onset of crack nucleation. Strain and slip irreversibility are investigated at the nanometer scale using high-resolution digital image correlation and high-resolution electron backscatter diffraction, highlighting distinct deformation mechanisms contributing to crack nucleation. It is observed during early fatigue cycling at relatively low applied stress, the formation of intense slip events that induce grain boundary shearing. This results in intense micro-scale strain in the neighboring grains, producing localized plasticity and stresses. Such stresses facilitate fatigue extrusion–intrusion mechanisms during subsequent cycling, resulting in preferred crack nucleation. Finally, the configurations within the microstructure that promote such deformation and damage mechanisms sequence are highlighted.

Original languageEnglish (US)
Article number119657
JournalActa Materialia
StatePublished - Mar 1 2024


  • Cyclic slip irreversibility
  • Fatigue crack nucleation
  • High-resolution digital image correlation
  • Polycrystalline nickel-based superalloy
  • Strain localization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys


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