Effect of Zr, Er and Cr additions on microstructures and properties of Al–Zn–Mg–Cu alloys

The effects of Zr, Er and Cr additions on the microstructures, mechanical properties and corrosion resistance of Al–Zn–Mg–Cu alloy were investigated. The combined additions of Zr, Er and Cr to Al–Zn–Mg–Cu alloy led to the formation of coherent Zn, Mg, Cu, Cr-containing Al3(Zr, Er). These 15–25nm sec...

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Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2014-07, Vol.610, p.10-16
Main Authors: Fang, H.C., Chao, H., Chen, K.H.
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Al–Zn–Mg–Cu alloy
Applied sciences
Chromium
Cold working, work hardening
annealing, quenching, tempering, recovery, and recrystallization
textures
Corrosion
Corrosion mechanisms
Corrosion prevention
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Erbium
Exact sciences and technology
Intergranular corrosion
Intermetallic compounds
Materials science
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Microstructure
Physics
Recrystallization
Stress corrosion cracking
Treatment of materials and its effects on microstructure and properties
Zirconium
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Summary:The effects of Zr, Er and Cr additions on the microstructures, mechanical properties and corrosion resistance of Al–Zn–Mg–Cu alloy were investigated. The combined additions of Zr, Er and Cr to Al–Zn–Mg–Cu alloy led to the formation of coherent Zn, Mg, Cu, Cr-containing Al3(Zr, Er). These 15–25nm secondary precipitates remarkably inhibited the recrystallization of Al matrix, and numerous fine subgrain boundaries were retained. Compared to the partial recrystallized Al–Zn–Mg–Cu–Zr alloy, the unrecrystallized Al–Zn–Mg–Cu–Zr–Er–Cr alloy exhibited higher resistance to intergranular corrosion and stress corrosion with the improved mechanical properties and fracture toughness. The synergetic effects of Zr, Er and Cr on the precipitates, recrystallization and corrosion resistance of ultra-high strength Al–Zn–Mg–Cu alloys have been discussed.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2014.05.021