Dislocations Debris

Fig. 12.30. Dislocation debris beneath an indenter resulting from plastic deformation induced by indentation (courtesy of Marc Fivel).

Recrystallization occurs when a crystalline material is plastically deformed at a relatively low temperature and then heated [1]. The as-deformed material possesses excess bulk free energy resulting from a high density of dislocations and point-defect debris produced by the plastic... 

Figure 9.27. Climbing dislocations and loop debris associated with (0001) slip in dolomite deformed at 800°C. (From Barber et al. 1981.)...

After initial deformation, examination of the crystal surface, again by optical means, reveals a novel feature already discussed in fig. 8.3, namely, slip traces. These slip traces are the debris left in the wake of dislocations that have made their way to the crystal surface, leaving behind a jump across the relevant slip plane at its point of intersection with the crystal s surface. These slip traces bear a precise geometrical relation to the underlying crystalline geometry and thereby provide a central clue in ferreting out the microscopic origins of plastic deformation. 

Figure 9.13 Dislocation structure in U02+ t (x = 0.0001) deformed at 600 °C. Primary screw dislocations are marked A and seconda dislocations are marked B and C. Debris in the form of loops and dipoles are also seen. Foil cut parallel to the (111) slip plane. Data from Ref. (74). 

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