Abstract
In this paper, the cyclic strain resistance and cyclic fracture behaviour of aluminium alloy 2124 are examined. Test specimens of the alloy were cycled using tension-compression loading, under total strain control, over a range of plastic strains giving less than 10 4 cycles to failure. The alloy displayed hardening in both the longitudinal and transverse directions of the wrought plate. The observed hardening behaviour is ascribed to contributions from synergistic influences of dislocation multiplication and dislocation-dislocation interactions. The alloy followed the Coffin-Manson relation and exhibited a single slope for the variation of cyclic plastic strain amplitude with reversals to failure. Fracture of the alloy samples was predominantly transgranular for both orientations, with microscopic crack propagation along the grain boundaries. The low-cycle fatigue characteristics and fracture behaviour of the alloy are discussed in terms of competing and synergistic influences of cyclic plastic strain amplitude, response stress, intrinsic microstructural effects and dislocation-microstructure interactions during cyclic straining.
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