Age hardening and the potential for superplasticity in a fine-grained Al-Mg-Li-Zr alloys
- Fukuoka Univ. of Education (Japan). Dept. of Technology
- Univ. of Southern California, Los Angeles, CA (United States)
- Kyushu Univ., Fukuoka (Japan)
- Ufa State Petroleum Technical Univ. (Russian Federation). Inst. of Chemical Technology
- Ufa State Aviation Technical Univ. (Russian Federation). Inst. of Physics of Advanced Materials
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 {approximately} 1.2 {micro}m. 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 {approximately} 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.
- Sponsoring Organization:
- Ministry of Education, Science and Culture (Japan); National Science Foundation, Washington, DC (United States); Department of the Army, Washington, DC (United States)
- OSTI ID:
- 605821
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 29, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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