Cyclic stress–strain response and dislocation structures in polycrystalline aluminum

Fully reversed strain-controlled fatigue tests were performed on polycrystalline specimens of commercially 99.0% purity aluminum. The objective was to reveal the influence of plastic strain amplitude and fatigue cycles on dislocation arrangements and investigate the role of dislocation structures on cyclic deformation behavior of aluminum. The test specimens were cylindrical in shape having an effective gauge length section 6.5 mm in diameter …