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

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

Category
Academic article
Abstract
Stress 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.
Client
  • Research Council of Norway (RCN) / 247598
  • Research Council of Norway (RCN) / 197405
Language
English
Author(s)
Affiliation
  • Norwegian University of Science and Technology
  • SINTEF Industry / Materials and Nanotechnology
  • University of Cambridge
  • Diverse norske bedrifter og organisasjoner
Year
2020
Published in
Metals
ISSN
2075-4701
Publisher
MDPI
Volume
10
Issue
9