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Chapter 5: Problem 19

If the incomplete plane is below the slip plane, then the edge dislocation is (a) positive (b) negative (c) both a and \(b\) (d) none

Short Answer

Expert verified
(b) negative

Step by step solution

01

Understanding Edge Dislocations

An edge dislocation can be seen when an extra half plane of atoms is introduced midway through the crystal. Dislocations are commonly referred to as 'Burger's Vector'. The Burger's vector provides information about the magnitude and direction of lattice distortion of a dislocation. An edge dislocation is defined as 'positive' when the extra half-plane of atoms trends downward to the right, while it is 'negative' when it trends downward to the left.
02

Deducing the Answer

Given the condition that the incomplete plane is located below the slip plane, the direction of the Burger's vector or the distortion of the lattice plane trends downward to the left. This characteristic reflects a negative edge dislocation.

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