Abstract
Fatigue strength in high-humidity environment has been studied for aluminum alloys such as a high-strength aluminum alloy (A7075-T6), an annealed alloy (A7575-O) and a corrosion-resistant alloy (A5052-H34). Pits are easily initiated in the early stage at humidity exceeding the critical humidity. The critical humidity is 60 pct RH for high-strength aluminum alloys (A7075-T6 and A7075-O) and 70 pct RH for a corrosion-resistant alloy (A5052-H34). Fatigue strength in a high-humidity environment is reduced markedly for all aluminum alloys and is almost the same as that in ion-exchanged water. Thus, a transition of environmental fatigue strength was found with increasing humidity. The reduction ratio of fatigue strengh for A7075-T6 is higher than that for A7075-O and A5052-H34 due to the initiation of large corrosion pits and a high notch sensitivity. The results were compared with those for structural steels, and it was found that the critical humidity is lower and the reduction ratio higher for aluminum alloys than for structural steels.
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