Optimum trace copper levels for SCC resistance in a Zn-modified Al-5083 alloy

M. C. Carroll, R. G. Buchheit, G. S. Daehn, M. J. Mills

Research output: Contribution to journalConference articlepeer-review

20 Scopus citations


As β-phase formation has long been held accountable for stress-corrosion cracking (SCC) susceptibility, studies have been carried out in an effort to determine if minor additions of elements can potentially modify the characteristics of the grain boundary β-phase that forms. A series of alloys were cast that contained various levels of zinc, copper, and silver, in order to classify the nature of the grain boundary phase in the presence of these additional elements. In order to evaluate any measurable benefit to SCC resistance, tensile tests were carried out on alloys that were subjected to an extensive sensitization treatment, under slow strain rate conditions, in an aqueous NaCl environment. Under these conditions, it has been shown that zinc modifications alone are severely degrading to SCC resistance, while minor copper additions along with zinc can have a beneficial effect. The benefits exist in a very narrow window, however, as larger copper additions can have the undesirable additional effect of precipitating as corrosion-prone S-phase.

Original languageEnglish
Pages (from-to)1443-1448
Number of pages6
JournalMaterials Science Forum
Issue number3
StatePublished - 2002
EventAluminium Alloys 2002 Their Physical and Mechnaical Properties: Proceedings of the 8th International Conference ICAA8 - Cambridge, United Kingdom
Duration: Jul 2 2002Jul 5 2002


  • Aluminum-magnesium alloys
  • Copper and zinc additions
  • Grain boundary phase formation
  • Stress corrosion cracking

ASJC Scopus subject areas

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


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