Effects of thermomechanical processing on production of Al–Zn–Mg–Cu alloy plate

An Al–7.81Zn–1.81Mg–1.62Cu alloy was subjected to a kind of thermomechanical processing involving solution annealing, quenching, pre-precipitation and warm rolling, with the aim of finding a new efficient way to prevent recrystallization in Al–Zn–Mg–Cu (7XXX) series alloys. On the basis of informati...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2012-09, Vol.554, p.33-40
Main Authors: Deng, Yunlai, Zhang, Yunya, Wan, Li, Zhang, Xinming
Format: Article
Language:English
Subjects:
Aluminum alloys
Applied sciences
Cross-disciplinary physics: materials science
rheology
Elasticity. Plasticity
Exact sciences and technology
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microanalysis
Other heat and thermomechanical treatments
Phase transformation
Physics
Recrystallization
Thermomechanical processing
Treatment of materials and its effects on microstructure and properties
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Summary:An Al–7.81Zn–1.81Mg–1.62Cu alloy was subjected to a kind of thermomechanical processing involving solution annealing, quenching, pre-precipitation and warm rolling, with the aim of finding a new efficient way to prevent recrystallization in Al–Zn–Mg–Cu (7XXX) series alloys. On the basis of information on the microstructures from optical metallography (OM) and transmission electron microscopy (TEM), and on the textures from orientation distribution functions (ODFs), we learn that during subsequent solution treatment, appropriate nano/submicron-scale MgZn2 particles, which are precipitated in the thermomechanical processing, inhibit the migration of grain/sub-grain boundaries, and do not induce particle stimulated nucleation (PSN), thus leading to a remarkable decrease in the recrystallized fraction. Suitable thermomechanical processing produced an ultimate tensile strength of 528MPa and yield strength of 459MPa, as well as good intergranular corrosion (IGC) resistance.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2012.05.102