Coincidence Doppler broadening and 3DAP study of the pre-precipitation stage of an Al-Li-Cu-Mg-Ag alloy

T. Honma, S. Yanagita, K. Hono, Y. Nagai, M. Hasegawa

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31 Citations (Scopus)

Abstract

Pre-precipitation solute clustering in Al-Li-Cu-Mg-Ag and Al-Cu-Mg-Ag alloys has been investigated by coincidence Doppler broadening (CDB) spectroscopy of positron annihilation and three-dimensional atom probe (3DAP) analysis. Although Ag-Mg co-clusters form in the Al-Cu-Mg-Ag alloy in the early stage of aging, no evidence for the co-cluster formation was obtained from the Li containing alloy using 3DAP. While CDB spectra indicated that vacancies are associated with Ag after aging for 15 s in the Al-Cu-Mg-Ag alloy, vacancy-Ag association is suppressed in the Li containing alloy. Based on the 3DAP and CDB results, the reasons for the completely different clustering behaviors observed in these two similar alloys are discussed.

Original languageEnglish
Pages (from-to)1997-2003
Number of pages7
JournalActa Materialia
Volume52
Issue number7
DOIs
Publication statusPublished - 2004 Apr 19

Keywords

  • Aluminum alloys
  • Coincidence Doppler broadening
  • Positron annihilation
  • Precipitation
  • Three-dimensional atom probe

ASJC Scopus subject areas

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

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