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Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy

Published version
Peer-reviewed

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Authors

Lodgaard, Lars 
D. Marioara, Calin 

Abstract

jats:pStress corrosion cracking (SCC) in Cu-free Al-Zn-Mg (7xxx) aluminium alloys limits its use in many applications. In this work, we study in detail the microstructure of a peak and slightly overaged condition in an AA7003 alloy using transmission- and scanning electron microscopy in order to provide a comprehensive understanding of the microstructural features related to SCC. The SCC properties have been assessed using the double cantilever beam method and slow strain rate tensile tests. Grain boundary particles, precipitate free zones, and matrix precipitates have been studied. A difference in the SCC properties is established between the two ageing conditions. The dominating difference is the size and orientation of the hardening phases. Possible explanations correlating the microstructure and SCC properties are discussed.</jats:p>

Description

Keywords

40 Engineering, 4016 Materials Engineering

Journal Title

Metals

Conference Name

Journal ISSN

2075-4701
2075-4701

Volume Title

10

Publisher

MDPI AG