The Effect of Mean Stress and Environment on Corrosion Fatigue Behavior of 7075-T6 Aluminum.
RENSSELAER POLYTECHNIC INST TROY N Y MATERIALS DIV
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Axial fatigue tests were performed on a 7075-T6 aluminum alloy in tension-compression and under superimposed positive mean stresses in dry air and in aqueous 0.5N NaCl solution. Both corrosive environments and positive mean stresses resulted in lower fatigue lives but no interaction between these variables was observed. Crack initiation in air occurred at electropolish pits at inclusionalloy interfaces and propagated primarily in a Stage I crystallographic mode. A model for environment assisted cracking is presented which suggests that hydrogen induced cleavage is responsible for the degradation in fatigue properties of this alloy. Modified author abstract
- Properties of Metals and Alloys