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Illinois MATSE 280 Introduction to Engineering Materials, Lecture 5 - Part 2 : Line Defects, Dislocations and their Scale

By Duane Douglas Johnson1, Omar N Sobh2

1. Iowa State University (formerly University of Illinois Urbana-Champaign) 2. University of Illinois at Urbana-Champaign

Published on


Imperfections in Solids (Continue)


  • Line Defects: Dislocations and their Scale
  • Line Defects: Dislocations
  • Incremental Slip and Bond Breaking
  • Edge Dislocations Exiting Crystal Form Steps
  • Dislocations: Screw, Edge and Mixed (in handout)
  • Formation of Steps from Screw and Edge Dislocations
  • The Edge Dislocations and Burger’s Vector
  • Dislocations Can Create Vacancies and Interstitials
  • Planar Defects: Surfaces
  • Planar Defects: Grain Boundary
  • Relative Energies of Grain Boundaries
  • Dislocation Interactions Can Create Planar Defects!Small-Angle Grain Boundaries: a tilt and a twist
  • Twin Boundaries: an atomic mirror plane
  • Twin Boundaries: Load drop in F vs %EL
  • Stacking Faults: Messed up stacking
  • Optical Microscopy
  • Polymer, too: Colloidal Epitaxy via Focused Ion Beam Lithography
  • Use Microscopy to see defects: contrast using optical, electron, scanning probe
  • TEM Image of Dislocations in Ti Alloy

Tags, a resource for nanoscience and nanotechnology, is supported by the National Science Foundation and other funding agencies. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.