Microalloying of Sc, Ni, and Ce in an advanced Al-Zn-Mg-Cu alloy

Using TEM, SEM, XRD, and optical microscopy, the effects of microalloying elements of Sc, Ni, and Ce on the microstructure of a new super-high-strength ingot metallurgy (IM)/Al-Zn-Mg-Cu alloy (C912) have been correlated with mechanical properties and stress corrosion cracking (SCC) behavior. Using m...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 1999-04, Vol.30 (4), p.1017-1024
Main Authors: WU, Y.-L, FROES, F. H, CHENGGONG LI, ALVAREZ, A
Format: Article
Language:English
Subjects:
Aircraft
Alloys
Aluminum alloys
Applied sciences
Corrosion resistance
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fatigue, corrosion fatigue, embrittlement, cracking, fracture and failure
Fatigue, embrittlement, and fracture
Materials science
Metals. Metallurgy
Microscopy
Physics
Powder metallurgy
Stress corrosion cracking
Tensile strength
Treatment of materials and its effects on microstructure and properties
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Summary:Using TEM, SEM, XRD, and optical microscopy, the effects of microalloying elements of Sc, Ni, and Ce on the microstructure of a new super-high-strength ingot metallurgy (IM)/Al-Zn-Mg-Cu alloy (C912) have been correlated with mechanical properties and stress corrosion cracking (SCC) behavior. Using microalloying with Sc, Ni, and Ce, the C912 alloy can exhibit very high strength and good SCC resistance. Compared to the baseline C912 alloy, Sc refines the microstructure and retards recrystallization, Ni promotes the development of matrix precipitates, which enhance the strength and SCC resistance, and Ce has little effect on alloy strengthening in the three-microalloying additions studied. The Sc-containing alloy (C912s) is the most attractive and even exhibits higher strength than the new Alcoa aluminum alloy 7055 and the Russian alloy B96, which have the highest strengths of the commercial IM/Al-Zn-Mg-Cu alloys. (Author)
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-999-0154-1