Abstract
The high cycle fatigue (HCF) performance of a model Al-4Cu-0.05Sn alloy and three commercial AA2024, AA7050 and AA6061 alloys with different ageing conditions is studied in this thesis. The origin of enhanced fatigue performance in under aged Al alloys is due to the coupling of precipitate free zones (PFZ's) and dynamic precipitation during deformation. A pre-fatigue cyclic training process is applied to utilise the origin to develop a modified initial microstructure and a better fatigue performance is achieved.
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