Transmission electron microscopy study of the early stage of precipitates in aged Al-Li-Cu alloys

R. Yoshimura, T. J. Konno, E. Abe, K. Hiraga

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)

Abstract

We report here on the early stage of the precipitation behavior of aged Al-Li-Cu alloys using transmission electron microscopy. The δ′ phase (Al3Li, L12 structure (Structurbericht)) was found to exist in the as-quenched specimen containing 2.4 wt%-Li, whereas no precipitation was observed in the as-quenched specimen with 1.6 wt%-Li. After aging at 100 °C for 3 h, GP-I zones nucleated homogeneously in both specimens; but no δ′ phase was detected in the 1.6 wt%-Li alloy at that stage. As the aging proceeds, the δ′ phase nucleates and grows on the GP-I zones. The composite structure, in which the GP-I zone is flanked by a pair of lenticular δ′ particles, is stable in 180-200 °C. The facing lenticular δ′ particles on a GP-I zone were systematically found to be anti-phase with respect to each other.

Original languageEnglish
Pages (from-to)2891-2903
Number of pages13
JournalActa Materialia
Volume51
Issue number10
DOIs
Publication statusPublished - 2003 Jun 11

Keywords

  • Aging
  • Al-Li-Cu alloys
  • Structure
  • Transmission electron microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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