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Investigation of the Effect of Combination of Severe Plastic Deformation (ECAP) and Shot Peening on Fatigue Properties of an Al-Mg-Si Alloy

Mohammadi, Sajjad | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45946 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. Production of nanocrystalline (under 100nm) or submicron materials (100-1000nm), has been created to one of the most important problems in engineering. A well-known method to create Ultra-Fined Grains (UFG) is imposing high strains to metals in order to break the structure. Among lots of ways forproducing UFG metals, Equal Channel Angular Pressing (ECAP) is one of the most famous and common ways. On the other hand, Shot Peening has been being used for a long time to improve mechanical properties of metals by introducing nanocrystalline layer at the surface of specimen. The aim of the work, is investigation of the effect of combination of ECAP and Shot Peening on High Cycle Fatigue of 6082 Aluminum alloy. Fatigue, MicroHardness, and XRD are used tests in the thesis. Determination of cell size and cell block size were done theorotically and by using of XRD results.It was demonstrated that conducting Shot Peening On one pass ECAPed sample leads to create cells and cell blocks with the size of less than 80nm and 250 to 300nm, respectively. Existing of this structure from surface to subsurface of the alloy is the reason of improving fatigue life. Otherwise, for more than two pass ECAPed samples because of deterioration of nano and submicron structure in the subsurface layer, the fatigue life was decreased dramatically
  9. Keywords:
  10. Shot Peening ; Fatigue ; Equal Channel Angular Pressing (ECAP) ; Severe Plastic Deformation ; Softening ; Fatigue Properties ; Aluminum-Magnesium-Silicon Alloy

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