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Article

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

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Department of Physics, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
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Department of Materials Science and Metallurgy, University of Cambridge, Cambridge CB2 3QZ, UK
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SINTEF Industry, N-7465 Trondheim, Norway
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Benteler Automotive, 2830 Raufoss, Norway
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Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology (NTNU), N-7491 Trondheim, Norway
*
Author to whom correspondence should be addressed.
Metals 2020, 10(9), 1194; https://doi.org/10.3390/met10091194
Received: 15 August 2020 / Revised: 28 August 2020 / Accepted: 4 September 2020 / Published: 7 September 2020
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. View Full-Text
Keywords: aluminium alloys; stress corrosion cracking; transmission electron microscopy; EBSD; microstructure; grain boundaries aluminium alloys; stress corrosion cracking; transmission electron microscopy; EBSD; microstructure; grain boundaries
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MDPI and ACS Style

Lervik, A.; C. Walmsley, J.; Lodgaard, L.; D. Marioara, C.; Johnsen, R.; Lunder, O.; Holmestad, R. Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals 2020, 10, 1194. https://doi.org/10.3390/met10091194

AMA Style

Lervik A, C. Walmsley J, Lodgaard L, D. Marioara C, Johnsen R, Lunder O, Holmestad R. Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals. 2020; 10(9):1194. https://doi.org/10.3390/met10091194

Chicago/Turabian Style

Lervik, Adrian; C. Walmsley, John; Lodgaard, Lars; D. Marioara, Calin; Johnsen, Roy; Lunder, Otto; Holmestad, Randi. 2020. "Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy" Metals 10, no. 9: 1194. https://doi.org/10.3390/met10091194

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