Abstract
Abstract The effect of prestrain induced by load and displacement control low cycle fatigue (LCF) on subsequent tensile behavior of commercially pure copper was investigated. Mechanical properties obtained after post-fatigue tension (half-life fatigue followed by tension) were superior compared to quasistatic tension. There was significant improvement in strength with little change in ductility for the displacement control LCF prestrained sample after tensile test. However, there was appreciable simultaneous increment in both strength and ductility for load control half-life fatigue followed by tension sample compared to quasistatic tension. A thorough microstructural investigation reveals the presence of persistent slip bands (PSBs) in displacement control LCF sample, whereas the load control LCF sample shows a composite microstructure comprising cells and PSBs. This composite microstructure provides higher strength and ductility. The introduction of cyclic prestrain to a material will improve its monotonic properties, which is attributed to the cyclic prestrain-induced dislocation substructure.
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