. Electron microscopy; proceedings of the Stockholm Conference, September, 1956 . Fig. 1. Siibgrains in cold beaten Al. The average subgrain size is about 1 //, the average angular misorientation about 1^°. The dislocation density is lO^" per Extinction contours due to large range strains are shown at A and B. Magnification 12,000. Fig. 2. A sub-boundary consisting of uniformly spaced dis- locations. The average spacing of the dislocations is about 175 A. Magnification 120,000.

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