Abstract
Tests of 7050-T7451, 7050-T651 and 7075-T651 aluminum alloys show that these alloys exhibit similar fatigue-crack-growth kinetics in water vapor. The kinetics conform with the model for transport-controlled crack growth. The saturation water vapor pressure for the 7075-T651 alloy is lower than that for the 7050-T651 and 7050-T7451 alloys because tha latter alloys have rougher fracture surfaces. A slight increase in saturation pressure for 7050-T7451 compared to 7050-T651, on the other hand, is attributed to the difference in yield strengths. Good agreement between the experimentally determined saturation pressures and those predicted by the model provides further confirmation for the model for transport-controlled fatigue crack growth and its applicability to high-strength aluminum alloys.
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