Abstract
Cyclic response and fatigue damage have been studied on precipitation-hardened Al-4 pet Cu alloy as a function of particle type and spacing by means of scanning and transmission electron microscopy. Specimens strain cycled in tension-compression under controlledplastic-strain tests formed intense intragranular slip bands by a disordering mechanism when the microstructures contained precipitates penetrable by dislocations. These bands were the sites of crack nucleation and Stage I propagation. With the addition of impenetrable particles, slip was dispersed homogeneously; consequently, crack nucleation and Stage I propagation shifted to the grain boundaries. The cyclic response results were then applied to Tomkins’ model of fatigue life prediction. It was found that his equations were a conservative estimate of the actual results.
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Calabrese, C., Laird, C. High strain fatigue fracture mechanisms in two phase alloys. Metall Trans 5, 1785–1793 (1974). https://doi.org/10.1007/BF02644142
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DOI: https://doi.org/10.1007/BF02644142