Strength, corrosion, and environmentally assisted cracking of a 7075-T6 friction stir weld

C. S. Paglia, M. C. Carroll, B. C. Pitts, T. Reynolds, R. G. Buchheit

Research output: Contribution to journalConference articlepeer-review

49 Scopus citations

Abstract

The microstructure and hardness of a friction stir welded (FSW) 7075-T6 alloy has been correlated with mechanical properties, corrosion and environmental cracking behavior for transverse and longitudinal orientations. The strength and ductility of the weld micro-zones are controlled by grain size, the presence and size of the coherent intragranular precipitates, along with the degree of sensitization achieved during the weld process. The corrosion behavior is influenced by the intermetallic phases as well as the grain boundary phases and/or precipitate-free zones, although a discrimination on the intergranular susceptibility between the micro-zones could not be clearly achieved with conventional polarization techniques. The heat affected zone in the trailing side of the weld is the highest susceptible micro-zone to corrosion as well as environmental assisted cracking which correlate with the sensitization level i. e. with the extent of Cu depletion at grain boundary.

Original languageEnglish
Pages (from-to)1677-1684
Number of pages8
JournalMaterials Science Forum
Volume396-402
Issue number3
DOIs
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

Keywords

  • AA7075-T651
  • Corrosion
  • Environmental assisted cracking
  • Friction stir welding
  • Heat affected zones

ASJC Scopus subject areas

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

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