Loading...

The Effects of Temperature, Strain Rate and Number of Passes on Ecap Processing of WE43 Magnesium Alloy

Famil Hatami, Mohammad | 2019

478 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51686 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali; Akbarzadeh, Abbas
  7. Abstract:
  8. Equal Channel Angular Pressing (ECAP) is one of the most applicable severe plastic deformation procedures (SPD) which results in improvement of strength and ductility through grain refinement. WE43 magnesium alloy belongs to a group of alloys for medical industry because of its good biocompatibility. In this study, equal channel angular pressing was performed at different temperatures, strain rates and number of passes on strip-shape samples to achieve proper mechanical properties. Tensile properties, hardness and microstructural evolutions were evaluated and the results were analyzed according to the EDS test. Results shows that at 380 ℃ and 440 ℃ grain refinement was accomplished by continuous dynamic recrystallization, so that by performing 4 passes at 380 ℃, the grain size is decreased from 112 to 2 µm. Also, Increase of the number of passes results in increasing the ultimate strength, yield strength, ductility and hardness of the ECAPed samples through grain refining and consequent increase of the dislocation density. Minimum anisotropy was achieved for samples ECAPed at 380℃, this may attributed to occurrence of dynamic recrystallization and presence of rare earth elements in matrix, simultaneously. At lower strain rates, due to more time for restoration processes, a more equilibrium structure was obtained, although, significant change in mechanical properties was not observed
  9. Keywords:
  10. Equal Channel Angular Pressing (ECAP) ; Magnesium Alloy ; Recrystallization ; Mechanical Properties ; Temperature Effect ; Plastic Deformation

 Digital Object List

 Bookmark

No TOC