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Chapter 4: Problem 38

Cite the relative Burgers vector-dislocation line orientations for edge, screw, and mixed dislocations.

Short Answer

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Short Answer Question: Explain the relative Burgers vector-dislocation line orientations for edge, screw, and mixed dislocations. Short Answer: In edge dislocations, the dislocation line is perpendicular to the Burgers vector. In screw dislocations, the dislocation line is parallel to the Burgers vector. And in mixed dislocations, the dislocation line and the Burgers vector have an intermediate angle between them, neither parallel nor perpendicular.

Step by step solution

01

Define Burgers Vector and Dislocation Line

A Burgers vector is a vector used to represent the magnitude and direction of a lattice distortion due to a dislocation. The dislocation line is the line along which the atoms are displaced in the crystal lattice.
02

Define Edge Dislocation

An edge dislocation is a type of dislocation where the disturbance lies along the edge of the crystal lattice structure. In this case, the dislocation line is perpendicular to the direction of the Burgers vector.
03

Define Screw Dislocation

A screw dislocation is another type of dislocation where the disturbance is caused by a shear stress parallel to the crystal lattice structure. In this case, the dislocation line is parallel to the direction of the Burgers vector.
04

Define Mixed Dislocation

A mixed dislocation is a combination of edge and screw dislocation. It means that the dislocation line and the Burgers vector are neither parallel nor perpendicular but have an intermediate angle between them.
05

Identify Burgers Vector-Dislocation Line Orientation for Different Types of Dislocations

1. Edge Dislocation: In an edge dislocation, the dislocation line is perpendicular to the Burgers vector. 2. Screw Dislocation: In a screw dislocation, the dislocation line is parallel to the Burgers vector. 3. Mixed Dislocation: In a mixed dislocation, the dislocation line and Burgers vector have an intermediate angle between them, neither parallel nor perpendicular.

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