Abstract
A study has been made to understand the cyclic stress response and fatigue fracture characteristics of aluminum alloy 7150 in the T77 condition. Specimens of the alloy were cycled using tension-compression loading over a range of cyclic strains giving lives of more than 104 cycles to failure. The alloy displayed softening at all cyclic strain amplitudes. The observed softening behavior is ascribed to concurrent and competing influences of an interaction of mobile dislocations with the strengthening precipitates, and mutliple crack initiation culminating in macroscopic crack growth. Fracture of the alloy was largely intergranular with tortuous crack paths. The cyclic stress response and fracture behavior are briefly interpreted in terms of plastic strain amplitude, response stress, and deformation behavior.
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