Age hardening and the potential for superplasticity in a fine-grained Al-Mg-Li-Zr alloy |
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| Authors: | Minoru Furukawa Patrick B Berbon Terence G Langdon Zenji Horita Minoru Nemoto Nikolai K Tsenev Ruslan Z Valiev |
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| Affiliation: | (1) the Department of Technology, Fukuoka University of Education, 811-41 Fukuoka, Japan;(2) Department of Materials Science, the University of Southern California, 90089-1453 Los Angeles, CA;(3) Departments of Materials Science and Mechanical Engineering, the University of Southern California, 90089-1453 Los Angeles, CA;(4) the Department of Materials Science and Engineering, Kyushu University, 812-81 Fukuoka, Japan;(5) the Institute of Chemical Technology, Ufa State Petroleum Technical University, 450062 Ufa, Russia;(6) the Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, 450000 Ufa, Russia |
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| Abstract: | Experiments were conducted to determine the age-hardening characteristics and the mechanical properties of an Al-5.5 pct Mg-2.2
pct Li-0.12 pct Zr alloy processed by equal-channel angular (ECA) pressing to give a very fine grain size of ∼1.2 μm. The results show that peak aging occurs more rapidly when the grain size is very fine, and this effect is interpreted in
terms of the higher volume of precipitate-free zones in the fine-grained material. Mechanical testing demonstrates that the
ECA-pressed material exhibits high strength and good ductility at room temperature compared to conventional Al alloys containing
Li. Elongations of up to ∼550 pct may be achieved at an elevated temperature of 603 K in the ECA-pressed condition, thereby
confirming that, in this condition, the alloy may be a suitable candidate material for use in superplastic forming operations. |
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