Polycrystalline aluminium, fatigued at low stress, has been examined using Nomarski interference-contrast microscopy and electron microscopy. Persistent slip-bands were observed to form almost from the first cycle and their development was followed throughout a life of 5 × 106 cycles. Surface features other than persistent slip-bands were also formed and their development was studied. Cracks were initiated in these regions which were not associated with intense slip-banding, as well as occurring in persistent slip-bands.
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