Microalloying of Sc, Ni, and Ce in an advanced Al-Zn-Mg-Cu alloy
- Beijing Inst. of Aeronautical Materials (China)
- Univ. of Idaho, Moscow, ID (United States). Inst. of Materials and Advanced Processing
Using transmission electron microscopy (TEM), scanning electron microscopy, X-ray diffraction (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 (ultimate tensile strength (UTS) greater than 660 MPa) than the new Alcoa aluminum alloy 7055 and the Russian alloy B96f, which have the highest strengths of the commercial IM/Al-Zn-Mg-Cu alloys.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 347484
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 30, Issue 4; Other Information: PBD: Apr 1999
- Country of Publication:
- United States
- Language:
- English
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