Loading...

The Effect of Severe Plastic Deformation on the Microstructure and Mechanical Properties of Magnesium-Carbon Nanotube Composites

Samadishadlou, Mehrdad | 2016

673 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48500 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. In recent years, the light metal matrix composites with high specific strength have attracted great interests in electronics, aerospace, automobile,and medical industries. Additionally, employing sever plastic deformation is a matter of interest in industries in order to gaining micro and nano microstructure, and hence, proper mechanical properties. Considering two mentioned facts, in this project, the effects of sever plastic deformation parameters carry out by equal channel angular press on mechanical and microstructural properties of Magnesium AZ91-Carbon Nanotube composite are investigated.To do this, first the samples of mentioned composite were produced by casting, then their mechanical properties were measured using tensile,hardness, and shear punch tests. The optical microscopy and SEM examinations ensured achieving the appropriate structural parameters.Then, some billets of composite ingots were produced, machined, and severely deformed by ECAP at temperatures 250 350 ◦C in BC and A routs. To this end, dies with 120◦ and 135◦ die angles were utilized.Iin order to investigate the effects of SPD, the ECAPed samples were again subjected to tensile, hardness, and shear punch tests and optical microscopy and FESEM examinations. The results indicated that mechanical properties of magnesium AZ91- Carbon Nanotube composites is improved due to the ECAP deformation. The strength of composite was 316 MPa and Elongation at failure was 13%. In all tested situations, the highest tensile strength was obtained by four pass ECAP die angle of 120◦ at 250 ◦C in BC rout, which was equal to 70% improvement. On the other hand, the highest elongation to failure was obtained by die angle of 120◦ at 350 ◦C using the BC rout, which showing 77% enhancement
  9. Keywords:
  10. Carbon Nanotubes ; Tensile-shear Strength ; Equal Channel Angular Pressing (ECAP) ; AZ91 Magnesium Alloy ; Severe Plastic Deformation

 Digital Object List

 Bookmark

No TOC