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Microstructural evolution and mechanical properties of friction stir welded AA2017 with different initial microstructures

Mirjalili, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1177/1464420713476400
  3. Abstract:
  4. Residual stresses, local mechanical properties, and microstructural evolution in terms of grain structures and precipitation distribution have been studied in friction stir welding of AA2017 in T4 and T6 conditions. Microstructural studies including optical and electron microscopy were made to characterize the developed microstructures in different zones of the weldment. Furthermore, X-ray diffraction technique and digital image correlation technique were also utilized to assess residual stress and mechanical properties of the welded alloy. The results show that coarsening of semi-coherent plate-shaped precipitates and formation of incoherent spherical-shaped particles occur in heat affected and thermomechanical affected zones while a non-uniform grain size distribution is formed in the stir zone because of asymmetric distributions of strain rate and temperature. Moreover, the developed residual stresses in the welded samples significantly enhance the effect of subsequent natural aging
  5. Keywords:
  6. Deformed structure ; Digital image correlation technique ; Grain size distribution ; Initial microstructures ; Local mechanical properties ; Natural aging ; Optical and electron microscopies ; Precipitation distribution ; X-ray diffraction techniques ; Aluminum alloys ; Friction stir welding ; Grain size and shape ; Microstructural evolution ; Microstructure ; Residual stresses ; Welding ; X ray diffraction ; Mechanical properties
  7. Source: Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications ; Vol. 228, issue. 1 , 2014 , p. 34-44
  8. URL: http://pil.sagepub.com/content/early/2013/02/08/1464420713476400.abstract