Polycrystalline aluminium sheet has been cycled to two stages of fatigue damage and the dislocation structures studied by transmission electron microscopy. The structures could be classified into a limited number of types, each characteristic of a particular stress axis. Direct correlation of the dislocation structures and the surface-deformation features was not achieved because of the presence of a dislocation-free zone at the crystal surfaces. Intuitive correlation, however, enabled models to be proposed linking surface and interior structures. Dislocation motion occurring within each structure during fatigue is discussed.
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