Journal
MATERIALS CHARACTERIZATION
Volume 163, Issue -, Pages -Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.matchar.2020.110232
Keywords
AA7010; Overaged microstructure; Copper rich interface; Copper enrichment; Nano-scale element distribution; Al-Zn-Mg-Cu alloy
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Funding
- OTTO FUCHS KG, Meinerzhagen, Germany
- EPSRC [EP/R001715/1]
- EPSRC [EP/S019367/1, EP/P025021/1, EP/R001715/1] Funding Source: UKRI
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High strength Al-Zn-Mg-Cu (7xxx) aluminium alloys obtain the required balance of mechanical and corrosion properties through complex heat treatments developed through empirical experiment. Understanding the influence of these heat treatments on the composition of the strengthening precipitates (eta' and eta-phase) is critical to obtain a better mechanistic understanding of their effect. In this work, the composition of strengthening precipitates has been studied at the atomic scale in microstructures of commercially processed AA7010 alloy in the standard overaged temper state. Copper enrichment in the precipitates on over-aging is confirmed for both small (eta') and large (eta) particles. It is demonstrated that in addition to entering the precipitates, a copper enriched layer forms at the particle/matrix interface on the broad faces of the precipitate plates. The implications of this structure for the mechanical and environmentally assisted cracking performance of the alloy are discussed.
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