Precipitation and strengthening in aluminium alloys

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99 Citations (Scopus)


Different transformation paths leading to the precipitation of the hardening phase are discussed in two important age-hardenable aluminium alloy systems, the Al-Zn-Mg and the Al-Li alloys. In Al-Zn-Mg alloys the role of GP zones and of vacancy rich clusters in the nucleation of the η' phase, as well as the reversion of GP zones is considered. In Al-Li alloys the precipitation of the Ll2 ordered, δ' (Al3Li) particles may progress through a variety of transformation stages, including short- and long-range ordering, and decomposition. Both ordering and decomposition may take place by nucleation and growth or by spinodal mechanism, increasing thereby the number of the possible combinations of consecutive transformation steps. The often returning question of the existence of GP zones in Al-Li alloys, as a precursor phase physically different from δ' is also discussed. Experimental results on the particle strengthening in the two alloys are correlated with theory.

Original languageEnglish
Pages (from-to)43-56
Number of pages14
JournalMaterials Science Forum
Issue numberPART 1
Publication statusPublished - Dec 1 1996


  • Al-Li alloys
  • Al-Zn-Mg alloys
  • Guinier-Preston zones
  • Nucleation
  • Particle strengthening
  • Reversion

ASJC Scopus subject areas

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

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