Microstructural characterisation and mechanical properties of dissimilar AA5083-copper joints produced by friction stir welding

Gihad Karrar, Alexander Galloway, Athanasios Toumpis, Hongjun Li, Fadi Al-Badour

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Abstract

This work aims to study the influence of the tool rotational speed and tool traverse speed on dissimilar friction stir butt welds on 3 mm thick AA5083 to commercially pure copper plates. Complex microstructures were formed in the thermo-mechanically affected zone, in which a vortex-like pattern and lamellar structures were found. Several intermetallic compounds were identified in this region, such as Al2Cu, Al4Cu9 and these developed an inhomogeneous hardness distribution. The highest ultimate tensile strength of 203 MPa and joint efficiency of 94.8% were achieved at 1400 rpm tool rotational speed and 120 mm/min traverse speed. Placing the softer material (aluminium) on the advancing side produced an excellent metallurgical bond with no requirement for tool offsetting.
Original languageEnglish
Pages (from-to)11968-11979
Number of pages12
JournalJournal of Materials Research and Technology
Volume9
Issue number5
Early online date2 Sep 2020
DOIs
Publication statusE-pub ahead of print - 2 Sep 2020

Keywords

  • intermetallic compounds
  • friction stir welding
  • mechanical properties
  • dissimilar joining
  • AA5083
  • commercially pure copper

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