Age-hardening of an Al-Li-Cu-Mg alloy (2091) processed by high-pressure torsion

Seungwon Lee, Zenji Horita, Shoichi Hirosawa, Kenji Matsuda

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

This research presents the successful strengthening of an Al-Li-Cu-Mg alloy (2091) through the simultaneous use of grain refinement and age hardening. Following solid-solution treatment, the alloy was processed by high-pressure torsion (HPT) at room temperature and the grain size was refined to ∼140. nm. The Vickers microhardness increased with increasing strain, and saturated to a constant level of 225. Hv. A further increase in the hardness to ∼275. Hv was achieved by aging the HPT-processed alloy at 100 °C and 150 °C. Bending tests for the samples treated using the peak aging conditions demonstrated that the stress was significantly increased while considerable ductility was retained. Transmission electron microscopy revealed that the small grains are well retained even after prolonged aging, and the precipitation of fine δ' particles occurred within the small grains, which confirms that simultaneous strengthening from grain refinement and age hardening is feasible in this alloy.

Original languageEnglish
Pages (from-to)82-89
Number of pages8
JournalMaterials Science and Engineering A
Volume546
DOIs
Publication statusPublished - Jun 1 2012

Fingerprint

precipitation hardening
Age hardening
Torsional stress
torsion
Aging of materials
Grain refinement
Strengthening (metal)
hardening
Bending tests
ductility
Microhardness
microhardness
Ductility
Solid solutions
solid solutions
hardness
grain size
Hardness
Transmission electron microscopy
transmission electron microscopy

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Age-hardening of an Al-Li-Cu-Mg alloy (2091) processed by high-pressure torsion. / Lee, Seungwon; Horita, Zenji; Hirosawa, Shoichi; Matsuda, Kenji.

In: Materials Science and Engineering A, Vol. 546, 01.06.2012, p. 82-89.

Research output: Contribution to journalArticle

Lee, Seungwon ; Horita, Zenji ; Hirosawa, Shoichi ; Matsuda, Kenji. / Age-hardening of an Al-Li-Cu-Mg alloy (2091) processed by high-pressure torsion. In: Materials Science and Engineering A. 2012 ; Vol. 546. pp. 82-89.
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