Microstructures and the Mechanical Properties of the Al–Li–Cu Alloy Strengthened by the Combined Use of Accumulative Roll Bonding and Aging

Yongpeng Tang*, Shoichi Hirosawa, Seiji Saikawa, Kenji Matsuda, Seungwon Lee, Zenji Horita, Daisuke Terada

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

Herein, the age-hardening behavior of the severely deformed and then artificially aged A2099 Al–Li–Cu alloy is investigated by Vickers hardness test, tensile test, and transmission electron microscopy (TEM). The combined processes of accumulative roll bonding (ARB) and aging treatment at 373 K for 2419 ks result in the highest hardness (≈190 HV) for the 5-cycled ARB sample with an age hardenability of 37 ± 2 HV. For the 2-cycled ARB sample with aging treatment, the ultimate tensile strength and elongation to failure reach 553 MPa and 7%, which are greater than those of the ARB sample without aging treatment (i.e., 442 MPa and 1%). The corresponding TEM microstructures suggest that the refined δ′–Al3Li particles formed by spinodal decomposition are responsible not only for higher hardness and strength but also for the optimized strength–ductility balance. Therefore, our proposed strategy, i.e., “take advantage of spinodal decomposition,” is regarded as a convincing approach to induce nanosized precipitates within ultrafine grains for optimizing the strength–ductility balance.

Original languageEnglish
Article number1900561
JournalAdvanced Engineering Materials
Volume22
Issue number1
DOIs
StatePublished - 2020/01/01

Keywords

  • Al–Li–Cu alloys
  • accumulative roll bonding
  • concurrent strengthening
  • spinodal decomposition

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics

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