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An Investigation Into the Dissimilar Friction Stir Welding of Severely Plastic Deformed Aluminum and Copper Sheets

Barekatain, Hamid | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43661 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen; Kokabi, Amir Hossein
  7. Abstract:
  8. Lots of investigations have been focused on dissimilar friction stir welding of aluminum and copper plates. Sever plastic deformation is a way to produce nanostructure materials, without changing in their appearance. The size of sever plastic deformed sheets in light of restriction in load capacity and equipments is limited and less industrial application can be found. Joining is the best solution for this problem. Therefore in this study, dissimilar friction stir welding of severely plastic deformed aluminum and copper sheets has been investigated. Friction stir welding is one of the best methods to join ultrafine grain materials.In this study, 3 mm-thick 1050 aluminum alloy and commercially pure copper in annealed and severely plastic deformed condition were used. The annealed and severely plastic deformed sheets were subjected to FSW at rotation rate of 600, 800, 900, 1000, 1200, 1400 rpm, and traverse speed of 50, 63, 80, 100, 125 mm/min. Constant offset of approximately 1 mm were used through Al side for all welds. Cu was placed in advancing side. Afterward, the mechanical properties and microstructures of friction stir welded specimens were investigated. A range of welding parameters and subsequently a range of heat-input which can lead to acceptable welds with appropriate mechanical properties, both in annealed and severely plastic deformed samples, have been found. In stir zone of all the welds two intermetallic compounds (Al2Cu and Al4Cu9) have been observed. Further investigation revealed that sever plastic deformation has caused a little increase in electrical resistance of welds.

  9. Keywords:
  10. Copper ; Aluminum ; Friction Stir Welding ; Severe Plastic Deformation

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