SEDL / STP / STP821-EB / STP34453S

Corrosion Fatigue of 7000 Series Aluminum Alloys

Henry Holroyd, NJ
Senior Metallurgist, Alcan International Limited, Banbury, Oxon

Hardie, D
Senior Lecturer, University of Newcastle upon Tyne,

Pages: 14    Published: Jan 1984

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Abstract

Results of fatigue testing of 7017-T651 aluminum alloy in seawater at frequencies from 0.1 to 70 Hz have been assessed in relation to the stress corrosion behavior of this material. In particular, the applicability of a simple superposition model is examined. Detailed fractographic examination indicates a dependence of fracture mode upon both crack growth rate and frequency that is consistent with a dependence upon the rate of diffusion of hydrogen in the material. Despite this, it seems that some other process provides the rate-determining step in the cracking. Various possibilities are considered.