Modeling lattice rotation fields from discrete crystallographic slip bands in superalloys

Marat I. Latypov, Jonathan M. Hestroffer, Jean Charles Stinville, Jason R. Mayeur, Tresa M. Pollock, Irene J. Beyerlein

Research output: Contribution to journalArticlepeer-review

Abstract

In this work, we investigate the relationship between an intense slip band (ISB) and the zone of large lattice rotations that forms ahead of the tip of the ISB. We develop a crystal plasticity finite element model of a discrete ISB lying within an oligocrystalline assembly and calculate the local crystalline stress and lattice rotation fields generated by the ISB. The calculations demonstrate that, first, a region of severe lattice rotations, commonly referred to as a microvolume, does not form without the ISB, and second, large amounts of accumulated slip in the ISB are required to enlarge the microvolume to sizes and rotation magnitudes observed experimentally. Ahead of the ISB tip, the quintessential plastic zone always forms, but the atypical microvolume forms when non-concentrated and spatially diffuse slip is activated by the ISB-induced stress field. This result suggests that the detrimental ISB/microvolume pair will likely appear in pairs of crystals in which transmission of the slip from the ISB is severely blocked by the grain boundary, a hypothesis that we verify with a few target cases.

Original languageEnglish (US)
Article number101468
JournalExtreme Mechanics Letters
Volume49
DOIs
StatePublished - Nov 2021
Externally publishedYes

Keywords

  • Crystal plasticity
  • Grain boundary
  • Lattice rotation
  • Ni-base superalloys
  • Slip bands

ASJC Scopus subject areas

  • Bioengineering
  • Chemical Engineering (miscellaneous)
  • Engineering (miscellaneous)
  • Mechanics of Materials
  • Mechanical Engineering

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