Microstructural Development during Fatigue of a Polycrystalline 3003 Aluminum Alloy

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Polycrystalline 3003 aluminum alloy has been cyclically deformed at room temperature with constant plastic-strain amplitudes in the range 1×10<sup>-4</sup>-5×10<sup>-3</sup>. At any strain amplitude, stress saturation was not observed: A monotonic hardening occurred at low plastic-strain amplitudes less than 5×10<sup>-4</sup>. Sequence of hardening, softening and secondary hardening was found at medium strain amplitudes in the range 1×10<sup>-3</sup>-3×10<sup>-3</sup>. Dislocation configurations in fatigued samples depended on the strain amplitudes and the number of cycles. At low strain amplitudes less than 1×10<sup>-3</sup>, 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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  • ISIJ international  

    ISIJ international 37(12), 1230-1236, 1997-12-15 

    The Iron and Steel Institute of Japan

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