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Electron microscope is used to study the dependence of the densities of grain interior dislocations and extrinsic grain boundary dislocations (EGBD's) in plastically deformed aluminium. The experiments show that the grain interior dislocation density increases with strain but the random high‐angle grain boundaries are free from EGBD's which can be observed only on special boundaries (i. e. coincidence or low and medium angle). This behaviour of different types of grain boundaries can be explained in terms of EGBD core width after spreading which cannot exceed the grain boundary period of special boundaries.

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