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An Investigation into the mechanical properties and micro-structure of Aluminum tube after Severe Plastic Deformation and Annealing

Zangiabadi, Amir Ali | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42163 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Kazeminezhad, Mohsen
  7. Abstract:
  8. Several SPD methods have been invented for processing rods and sheets, and their physical and mechanical properties have been investigated so far. The materials processed by these methods have not been industrialized thoroughly. Moreover, in previous investigations, few works have been carried out on tubular types of materials. Thus, in this study, aluminum tube goes through a tubular channel in order to achieve different values of strains. This method is named Tube Channel Pressing. The mechanical and microstructural investigations on aluminum tubes which have been processed up to 5 passes shows that ultimate strength increases 1.7 times and sub-grains size reaches to 360 nm. Applying final annealing on aluminum tubes at the temperature ranges of 175-225 °C leads to improvement of ultimate strength, yield stress and hardness. Moreover, microstructural investigations on these samples reveal no grain growth, less defects in crystalline structure and consequently increase of grain-boundaries angle. These findings have a good consistency with the results of tensile and hardness tests. In order to simulate tube channel pressing with finite element method, modified Estrin–Tόth–Molinari–Brechet constitutive model has been employed to consider a realistic flow stress of the material strained up to 6. Subsequently, the simulation results have been compared with the experimental results. In this study, alternative processing routes have been introduced and the applicability of these routes has been assessed.

  9. Keywords:
  10. PIPES ; Mechanical Properties ; Nanostructure ; Aluminum ; Severe Plastic Deformation

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