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Thermal stability during annealing of friction stir welded aluminum sheet produced by constrained groove pressing

Sarkari Khorrami, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.matdes.2012.08.064
  3. Abstract:
  4. The severely deformed aluminum sheets with strain of 2.32 were successfully joined by friction stir welding (FSW) process. Welding was carried out at various rotation speeds of 600, 800, and 1000. rpm at traveling speed of 200. mm/min corresponding to various revolution pitches of 0.33, 0.25, and 0.20. mm/r, respectively. In order to investigate the thermal stability of the joints, annealing was carried out at temperature of 200 °C for 1. h. Microstructure examinations revealed that severely deformed samples were quite unstable upon FSW process. However, during annealing it was found that in contrast to regions of heat affected zone (HAZ) and thermo mechanical affected zone (TMAZ) where recrystallization and grain growth occurred, grain growth did not mainly occur at the stir zone showing the thermal stability of this area. Also, the mechanical properties of joints in as-welded and annealed conditions were examined. The microhardness measurements and transverse tensile tests were carried out. It was observed that all joints were fractured from TMAZ and stir zone interface
  5. Keywords:
  6. Recrystallization ; Severe plastic deformation ; Thermal stability ; Aluminum sheet ; Annealing ; Crystallization ; Friction stir welding ; Grain growth ; Mechanical properties ; Recrystallization (metallurgy) ; Tensile testing ; Thermodynamic stability ; Welding ; Constrained groove pressing ; Deformed samples ; Friction stir ; Microhardness measurement ; Microstructure examination ; Rotation speed ; Severe plastic deformations ; Stir zones ; Thermo-mechanical ; Transverse tensile ; Heat affected zone
  7. Source: Materials and Design ; Volume 45 , 2013 , Pages 222-227 ; 02613069 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0261306912006036