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

Minoru Furukawa, Patrick B. Berbon, Zenji Horita, Minoru Nemoto, Nikolai K. Tsenev, Ruslan Z. Valiev, Terence G. Langdon

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)

Abstract

Experiments were conducted to determine the age-hardening characteristics and the mechanical properties of an Al-5.5 pet Mg-2.2 pet Li-0.12 pet Zr alloy processed by equal-channel angular (EGA) 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 EGApressed material exhibits high strength and good ductility at room temperature compared to conventional Al alloys containing Li. Elongations of up to ∼550 pet may be achieved at an elevated temperature of 603 K in the EGA-pressed condition, thereby confirming that, in this condition, the alloy may be a suitable candidate material for use in superplastic forming operations.

Original languageEnglish
Pages (from-to)169-177
Number of pages9
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume29
Issue number1
DOIs
Publication statusPublished - Jan 1 1998

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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