Effects of the aging state and tensile strength on the fatigue
properties of 6A01 aluminum alloy
Abstract
Abstract To study the effects of the aging state and tensile strength on
the fatigue properties of 6A01 Al alloy, the high-cycle fatigue (HCF)
experiments were carried out for different aging states. The results
show that the 6A01 Al alloy with the highest tensile strength at
peak-aging state can exhibit the highest fatigue strength in comparison
with the overaged state and the underaged state. The main reason is that
the increased strength of the 6A01 Al alloy at peak-aging state can
improve the plastic deformation resistance and inhibit the fatigue crack
initiation. Besides, the intermittent distribution of grain boundary
precipitates at the peak-aging state is beneficial for reducing the
fatigue damage. From these results, it is verified that the tensile
strength plays a key role in the fatigue strength relative to the aging
state for the low-strength Al alloys.