Dislocation dynamics in a nickel-based superalloy via in-situ transmission scanning electron microscopy

J. C. Stinville, Eric R. Yao, Patrick G. Callahan, Jungho Shin, Fulin Wang, McLean P. Echlin, Tresa M. Pollock, Daniel S. Gianola

Research output: Contribution to journalArticlepeer-review


Micro-tensile specimens of nickel-based superalloy oligocrystals were tested in-situ in an scanning electron microscope in transmission mode (TSEM) enabling observation of dislocations. The dynamics of dislocation motion during tensile loading were captured and correlated with the measured intermittencies during plastic flow recorded by high load- and temporal-resolution sensors. This investigation in particular focused on the dislocation behavior near twin boundaries with different slip configurations. A multiplicity of deformation mechanisms at the dislocation scale were observed within individual slip bands, including precipitate shearing, dislocation decorrelation and antiphase boundary-coupled shearing. These processes affect strain localization near twin boundaries and provide new defect-level insights on plastic localization and fatigue crack initiation in these alloys.

Original languageEnglish (US)
Pages (from-to)152-166
Number of pages15
JournalActa Materialia
StatePublished - Apr 15 2019
Externally publishedYes


  • Dislocations dynamic
  • In-situ transmission scanning electron microscopy (TSEM)
  • Nickel-based superalloy rené 88DT
  • Plastic localization
  • STEM detector
  • Twin boundary

ASJC Scopus subject areas

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


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