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Figure 4
Metal structures as observed by non-X-ray microscopy. The micrographs correspond to snapshots in time for random locations after exposure to stress and heat. No direct information about dynamics can thus be obtained using this method. (a) Initial grain structure of a metal. (b) A well annealed grain structure shows evidence of tangled dislocations after some deformation. (c) With more deformation, these form into dislocation structures. (d) Upon annealing, new nuclei form and grow from this deformed matrix.

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