To provide some perspective on the dimensions of atomic defects, consider a metal specimen with a dislocation density of 105 mm–2. Suppose that all the dislocations in 1000 mm3 (1 cm3) were somehow removed and linked end to end. How far (in miles) would this chain extend? Now suppose that the density is increased to 109 mm–2 by cold working. What would be the chain length of dislocations in 1000 mm3 of material?
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