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

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

14 Nov 2008

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

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," https://nanohub.org/resources/5864.

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