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Chapter 4: Problem 26

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

Short Answer

Expert verified
Answer: For edge dislocations, the Burgers vector is perpendicular to the dislocation line, resulting in an extra half-plane of atoms within the crystal structure. For screw dislocations, the Burgers vector is parallel to the dislocation line, causing a helical path along the dislocation line in the crystal structure. In mixed dislocations, the Burgers vector is at an angle to the dislocation line, exhibiting characteristics of both edge and screw dislocations with a combination of an extra half-plane of atoms and a helical path along the dislocation line.

Step by step solution

01

Edge Dislocation

In an edge dislocation, the Burgers vector is perpendicular to the dislocation line. The defect appears as an extra half-plane of atoms within the crystal structure, leading to a distortion in the atomic arrangement.
02

Screw Dislocation

In a screw dislocation, the Burgers vector is parallel to the dislocation line. This type of dislocation occurs when the crystal structure forms a helical path along the dislocation line, causing distortion in the atomic arrangement.
03

Mixed Dislocation

In a mixed dislocation, the Burgers vector is neither parallel nor perpendicular to the dislocation line, which means it is at an angle to the dislocation line. This type of dislocation has characteristics of both edge and screw dislocations, with the defect appearing as a combination of an extra half-plane of atoms and a helical path along the dislocation line.

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