Fundamentals of Materials Science and Engineering: An Integrated Approach, 3e

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142 • Chapter 5 / Imperfections in Solids

Dislocation

line

Burgers vector b

D

C

(a)

AB

D C

(b)

A

b

Figure 5.9 (a) A screw dislocation within a crystal. (b) The screw dislocation in (a)as

viewed from above. The dislocation line extends along lineAB. Atom positions above the

slip plane are designated by open circles, those below by solid circles. [Figure (b) from

W. T. Read, Jr.,Dislocations in Crystals,McGraw-Hill Book Company, New York, 1953.]