Evaluation of high-cycle fatigue properties of Al-Cu alloy (effect of temper condition)

Abstract

In order to evaluate the effect of solute Cu atoms on the high-cycle fatigue properties, Al-Cu binary alloys subjected to different tempering conditions are tested at room temperature. The S-N diagram of the naturally aged (NA) alloy shows a distinct fatigue limit while the artificially aged (AA) alloy does not. The fatigue life of the NA alloy is longer than the AA alloy, which is attributed to the higher resistance against crack growth.