| |
The diagram
shows the effect of 'sliding' an Edge (a), Screw (b), or Mixed (c) dislocation
completely across a slip plane in the crystal. Each dislocation has
the same effect as it moves completely over the slip plane: it displaces the
top of the crystal with respect to the part below the slip plane by a 'ruck
size' characteristic of the dislocation. This size is known as the Burgers
vector, b,
of the dislocation and is shown in blue on the diagram. The Line direction
(red) of each dislocation is shown. For an Edge dislocation, the Burgers
vector and the line are perpendicular and in the slip plane. For the Screw dislocation
they are parallel, and for the Mixed dislocation each section of the
line makes a different angle with the Burgers vector which has a constant
magnitude and direction. |
|
|
|
|
|
|
|
|
|
|
|
|
| |
|
|
From: Barrett,
Nix, and Tetelman,
"The Principles of Engineering Materials," Prentice
Hall (1973) |
|
|
