Dislocation cells in additively manufactured metallic alloys characterized by electron backscatter diffraction pattern sharpness

Fulin Wang, Jean Charles Stinville, Marie Charpagne, McLean P. Echlin, Sean R. Agnew, Tresa M. Pollock, Marc De Graef, Daniel S. Gianola

Research output: Contribution to journalArticlepeer-review

Abstract

Metallic alloys produced by additive manufacturing often host complex and hierarchical microstructures with grains exhibiting large orientation gradients, along with sub-grain dislocation cells. These multiscale features act in concert to control mechanical behavior, yet are challenging to characterize at high fidelity over large areas. Here, we quantify the sharpness of electron backscatter diffraction patterns obtained from several additively manufactured metallic alloys to directly image the dislocation cells at the mesoscale in bulk materials. The sharpness metric employed herein reflects the elastic strain field from dislocations, and exhibits unique advantages, including being proportional to local dislocation density, insensitive to grain orientation, and inherently correlated with orientation mapping and its related modalities. Our results demonstrate that the cell walls do not always possess appreciable misorientations, and thus do not always contain large fractions of geometrically necessary dislocations, thereby furthering our understanding of the origin and implications of the profuse dislocation cells produced during additive manufacturing.

Original languageEnglish (US)
Article number112673
JournalMaterials Characterization
Volume197
DOIs
StatePublished - Mar 2023
Externally publishedYes

Keywords

  • Additive manufacturing
  • Dislocation cell
  • Electron backscattering diffraction (EBSD)
  • Metal and alloys
  • Microstructure

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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