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

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Abstract

Imperfections in Solids (Continue)

Content:

  • 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
  • SUMMARY

Cite this work

Researchers should cite this work as follows:

  • Duane Douglas Johnson; Omar N Sobh (2008), "Illinois MATSE 280 Introduction to Engineering Materials, Lecture 5 - Part 2 : Line Defects, Dislocations and their Scale," http://nanohub.org/resources/5864.

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