Accession Number : AD0763455

Title :   The Effect of Mean Stress and Environment on Corrosion Fatigue Behavior of 7075-T6 Aluminum.

Descriptive Note : Technical rept.,

Corporate Author : RENSSELAER POLYTECHNIC INST TROY N Y MATERIALS DIV

Personal Author(s) : Corsetti,L. V. ; Duquette,D. J.

Report Date : 10 APR 1973

Pagination or Media Count : 30

Abstract : 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 inclusion/alloy 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)

Descriptors :   (*ALUMINUM ALLOYS, FATIGUE(MECHANICS)), (*CORROSION, ALUMINUM ALLOYS), STRESSES, DEFORMATION, CRACK PROPAGATION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE