Loading...

Study of Microstructural and Textural Evolution and Mechanical Properties of 1050 Aluminum Alloy Through Ecap, Annealing and Rolling

Asadi, Parvaneh | 2015

737 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47724 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh Changiz, Abbas
  7. Abstract:
  8. In the present study, the microstructural and textural evolutions and mechanical properties of 1050 Aluminum alloy was investigated through ECAP processing. The effects of annealing and strain path change by cold rolling on the ECAPed specimens were also investigated. The number of ECAP passes, annealing temperature and reduction of area during cold rolling were chosen as the variable parameters. The results showed that the grains became finer by increasing the ECAP passes. It is shown that the volume fraction of low angle grain boundaries increased in the first two passes. However, the volume fraction of high angle grain boundaries increased in the next passes. Continuous dynamic recrystallization was identified as the dynamic recrystallization mechanism. Intermediate annealing at 150 °C had minor effect on the grain size in spite of increase of the misorientation angle of the high angle grain boundaries. This is related to the absorption of dislocations to low angle grain boundaries and increase of their misorientation angle. It is observed that the microstructure became finer and more elongated by conducting cold rolling. Study of texture evolution showed that the ideal simple shear components, as the main mode of deformation during ECAP process, were developed during processing. Annealing of ECAP specimens did not change the texture component. However, intensities of the components have changed. On the other hand, cold rolling completely altered the texture and copper type texture evolved after cold rolling. The combination of ECAP, annealing and cold rolling improved the strength of the material in spite of decrease of the ductility. Enhancing the dislocation density besides the grain refinement was considered as the responsible cause of the aforementioned strengthening. Results of the present study indicate that combination of ECAP, annealing and changing the strain path conditions to control the microstructure and texture leading to improvement of the mechanical properties of the materials in comparison to the ECAP processing
  9. Keywords:
  10. Equal Channel Angular Pressing (ECAP) ; Cold Rolling ; Mechanical Properties ; Texture Evolution ; Aluminum Alloy 1050 ; Microstructural Changes ; Pure Aluminum

 Digital Object List

 Bookmark

No TOC