Age hardening and the potential for superplasticity in a fine-grained Al-Mg-Li-Zr alloys

Journal Article · Thu Jan 01 04:00:00 EST 1998 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-998-0170-6· OSTI ID:605821

Furukawa, Minoru ^[1]; Berbon, P B; Langdon, T G ^[2]; Horita, Zenji; Nemoto, Minoru ^[3]; Tsenev, N K ^[4]; Valiev, R Z ^[5]

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1. Fukuoka Univ. of Education (Japan). Dept. of Technology
2. Univ. of Southern California, Los Angeles, CA (United States)
3. Kyushu Univ., Fukuoka (Japan)
4. Ufa State Petroleum Technical Univ. (Russian Federation). Inst. of Chemical Technology
5. 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, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 1 Vol. 29; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
AGE HARDENING
ALUMINIUM BASE ALLOYS
LITHIUM ALLOYS
MAGNESIUM ALLOYS
MATERIALS WORKING
MECHANICAL PROPERTIES
MICROSTRUCTURE
ZIRCONIUM ADDITIONS