Abstract
Polycrystalline 3003 aluminum alloy has been cyclically deformed at room temperature with constant plastic-strain amplitudes in the range 1x10 -4 -5x10 -3 . At any strain amplitude, stress saturation was not observed: A monotonic hardening occurred at low plastic-strain amplitudes less than 5x10 -4 . Sequence of hardening, softening and secondary hardening was found at medium strain amplitudes in the range 1 x 10 -3 -3x10 -3 . Dislocation configurations in fatigued samples depended on the strain amplitudes and the number of cycles. At low strain amplitudes less than 1x10 -3 , loop patches with a particular periodicity in dislocation arrangement were formed during the first hardening stage. The labyrinth structure composed of dislocation walls periodically arranged along the {100} planes was formed during the softening stage at the medium strain amplitudes. The stable dislocation configuration after the secondary hardening was found to be the cell structure. The microstructural analysis using transmission electron microscopy is well applicable to the fatigue life assessments of the 3003 aluminum alloy.
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