Precipitation processes in Al-4Cu-(Mg, Cd) (wt. %) alloys

Bondan T. Sofyan, Ian J. Polmear, Simon P. Ringer

Research output: Contribution to journalConference articlepeer-review

14 Citations (Scopus)


The precipitation processes during elevated temperature ageing of Al-4Cu-(Mg, Cd) (wt. %) alloys have been studied using transmission electron microscopy and three dimensional atom probe (3DAP). Enhanced precipitation of θ' (Al2Cu) was confirmed in Cd-containing alloys. Additions of Cd into the Al-Cu-Mg alloys also stimulated the precipitation of the o phase (Al5Cu6Mg2). In the ternary Al-Cu-Cd alloy, elemental Cd particles were detected in a uniform dispersion throughout the matrix and were attached to θ', while in the Al-Cu-Mg-Cd alloy, co-clustering of Cd-Mg was observed at early stages of ageing. This result suggests that the enhanced precipitation and associated hardening in the quaternary Al-Cu-Mg-Cd alloy is initiated by the Cd-Mg co-clusters, through what is called as cluster-assisted nucleation. The nucleation mechanism in the ternary Al-Cu-Cd alloy is almost certainly the same, although the chemistry of the initiating cluster which assists nucleation is different, which is thought to be Cd clusters.

Original languageEnglish
Pages (from-to)613-618
Number of pages6
JournalMaterials Science Forum
Issue number2
Publication statusPublished - 2 Dec 2002
EventAluminium Alloys 2002 Their Physical and Mechnaical Properties: Proceedings of the 8th International Conference ICAA8 - Cambridge, United Kingdom
Duration: 2 Jul 20025 Jul 2002


  • θ'
  • σ
  • 3DAP
  • Al-Cu-Mg alloys
  • Cd
  • Cd-Mg
  • Cluster
  • TEM


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