Effects of the Aging State and Tensile Strength on the Fatigue Properties of 6A01 Aluminum Alloy

Abstract To study the effects of the aging state and tensile strength onthe fatigue properties of 6A01 Al alloy, the high-cycle fatigue (HCF)experiments were carried out for different aging states. The resultsshow that the 6A01 Al alloy with the highest tensile strength atpeak-aging state can exhibit the highest fatigue strength in comparisonwith the overaged state and the underaged state. The main reason is thatthe increased strength of the 6A01 Al alloy at peak-aging state canimprove the plastic deformation resistance and inhibit the fatigue crackinitiation. Besides, the intermittent distribution of grain boundaryprecipitates at the peak-aging state is beneficial for reducing thefatigue damage. From these results, it is verified that the tensilestrength plays a key role in the fatigue strength relative to the agingstate for the low-strength Al alloys.