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Effect of Equal Channel Angular Pressing(ECAP) Parameters on Microstructure and Mechanical Properties of Strip Samples of AZ31 Mg Alloy

Arab, Mohammad | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41417 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh Changiz, Abbas
  7. Abstract:
  8. Equal Channel angular pressing (ECAP) is one of the most applicable Severe Plastic Deformation (SPD) Procedures which results in improvement of strength and ductility through grain refinement and an appropriate texture development. In this study, in order to achieve a proper orientation and microstructure, ECAP was performed in different routes and temperatures up to 4 passes on AZ31 magnesium alloy. Microstructure and mechanical properties were studied. X-ray diffraction analysis was performed to study the basal orientation variation and calculation of sub-grain size. In addition, cold rolling at room temperature was done on the fourth pass specimens, in order to study the effect of ECAP on formability. Grain size after 4 passes of ECAP by route C is finer than samples by route A along with a more homogenous distribution. Results show that turning specimens upside down between passes (route CUD) leads to more homogenous microstructure. It is observed that the grain size at first passes decreases significantly and the grain refinement is diminished at the next passes. It is also shown that the mean grain size is increased by raising the ECAP temperature. By similar ways, the hardness is rapidly increased at initial passes and then is remained constant. In spite of increase of the accumulated strain, yield and tensile strengths decrease. Nevertheless the total elongation is increased. Despite the facts that increase of the ECAP temperature leads to less grain refinement, because of forming a strong non-basal texture, the elongation is still high. ECAPed specimens at route CUD show the maximum elongation in tension tests accompanied with the highest reduction of cold rolling
  9. Keywords:
  10. Microstructure ; Mechanical Properties ; AZ31 Magnesium Alloy ; Equal Channel Angular Pressing (ECAP) ; Crystallographic Orientation

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