Journal
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
Volume 34, Issue 7, Pages 1250-1257Publisher
JOURNAL MATER SCI TECHNOL
DOI: 10.1016/j.jmst.2017.05.008
Keywords
Al-Zn-Mg alloy; Two-stage ageing; Double peaks ageing; Stress corrosion cracking (SCC) susceptibility; Grain boundary precipitates (GBPs)
Funding
- National Key R&D Program of China [2016YFB1200600, 2016YFB1200504]
- Strategic Priority Program of the Chinese Academy of Sciences [XDB22000000]
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Different artificial two-stage ageing behaviors and their effect on stress corrosion cracking (SCC) susceptibility of Al-Zn-Mg alloy have been investigated. The experimental results show that two hardness peaks present on the second-stage ageing-hardening curve when the first-stage ageing is dealt with comparatively lower temperature than the conventional one. The first peak is caused by dispersive and evenly distributed G.P. zones, while eta ' phases and coarsened G.P. zones contribute to the second peak. Tensile strength of experimental alloy raises 9.6% (33.2 MPa) and SCC susceptibility decreases 38.9% by applying the second peak ageing regime instead of conventional T73. Al-Zn-Mg alloy obtains high strength and SCC resistance due to its finely dispersive matrix precipitates (MPts), coarsened and discontinuous grain boundary precipitates (GBPs), as well as the narrow precipitate free zone (PFZ) in the second peak ageing condition. (C) 2017 Published by Elsevier Ltd on behalf of The editorial office of Journal of Materials Science & Technology.
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