Further Precipitation Reactions Associated with Beta' (Al3Zr) Particles in Al-Li-Cu-Mg-Zr Alloys

Abstract

Transmission electron microscopy has been used to investigate the precipitation reactions associated with Beta (A13Zr) particles in 8091 alloy sheet (<2 mm thick). The microstructures obtained at various stages of ageing have been studied. It was observed that in addition to acting as nucleation sites for the precipitation of delta (A13Li), the Beta particles also provide sites for the nucleation of dislocation loops. These loops then act as sites for the heterogeneous precipitation of S phase (A12CuMg) during ageing. An additional type of precipitate at the Beta sites has been identified as Theta (A12Cu).

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1988
Accession Number
ADA208350

Entities

People

  • C. N. Tite
  • P. D. Pitcher
  • P. J. Gregson

Organizations

  • Royal Aircraft Establishment

Tags

Communities of Interest

  • Air Platforms
  • Space

DTIC Thesaurus Topics

  • Age Hardening
  • Alloys
  • Aluminum
  • Aluminum Alloys
  • Diffraction
  • Dislocations
  • Electron Diffraction
  • Electron Microscopy
  • Foreign Languages
  • Lithium Alloys
  • Materials
  • Particles
  • Phase
  • Precipitation
  • Scattering
  • Transmission Electron Microscopy
  • X Rays

Fields of Study

  • Materials science

Readers

  • Environmental Remediation and Restoration.
  • Powder metallurgy of Titanium alloys.
  • Superconducting Magnet Technology

Technology Areas

  • Microelectronics