line defects edge dislocation burgers vector slipped dislocation line dislocation “core” a...

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LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector known as Burgers vector. Dislocation line is the boundary between the slipped and un-slipped areas. The dislocation line is perpendicular to the Burgers vector in edge dislocations. Un-slipped pted from “Engineering Materials 1” by Ashby and Jones

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Page 1: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

LINE DEFECTSEdge Dislocation

Burgers vector

slipped

Dislocation Line

Dislocation “core”

A dislocation is define by its line and its displacement vector known as Burgers vector.

Dislocation line is the boundary between the slipped and un-slipped areas.

The dislocation line is perpendicular to the Burgers vector in edge dislocations.

Un-slipped

Adapted from “Engineering Materials 1” by Ashby and Jones

Page 2: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

LINE DEFECTSScrew Dislocation

Dislocation line

cut

displace

The dislocation line is parallel to the Burgers vector in screw dislocations

Adapted from “Engineering Materials 1” by Ashby and Jones

Page 3: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

LINE DEFECTSMixed Dislocation

The character of a dislocation may change along its line, however the direction of the Burgers vector remains the same.

bb

Adapted from Figure 4.5 of Callister

Page 4: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

Observing Dislocations

Transmission Electron Microscopy (TEM) Etch Pitting

Copper

High Resolution TEM

Other techniques:- X-ray- Field Ion Microscopy

Page 5: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

Grain boundaries: • are boundaries between crystals. • have a change in crystal orientation across them. • form by many processes including solidification, deposition and recrystallization.

grain boundaries

Schematic

Adapted from Fig. 4.7, Callister 6e. Adapted from Fig. 4.10, Callister 6e. (Fig. 4.10 is from Metals Handbook, Vol. 9, 9th edition, Metallography and Microstructures, Am. Society for Metals, Metals Park, OH, 1985.)

Metal Ingot

AREA (PLANAR) DEFECTS: GRAIN BOUNDARIES

~ 8cm

heat flow

Page 6: LINE DEFECTS Edge Dislocation Burgers vector slipped Dislocation Line Dislocation “core” A dislocation is define by its line and its displacement vector

OBSERVING GRAIN BOUNDARIES

Optical Microscopy HRTEM

Low-angle boundary

Nanocrystalline Ni-15%Fe alloy

Adapted from Callister, Fig. 4-12

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