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An Investigation on the Deformation of a Near Euectic Al-Si Alloy Using the ECAE Process

Bakhtiary Davijani, Amir Hamed | 2011

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 42899 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Karimi Taheri, Ali
  7. Abstract:
  8. The use of aluminum and its alloys in different industries is increasing. To increase the deformability of Aluminum alloys, it is usually deformed at high temperatures. In Such working conditions, the chemical composition, temperature of deformation, strain rate and high temperature activating phenomena will affect the microstructure and final properties of the material. In this thesis the hot and cold deformation behavior of a Al-11.77%Si-0.2%Mg are evaluated. In the cold deformation, the alloy was first annealed and then ECAEed. The mechanical properties and the related microstructure were evaluated via the microhardness test. The results indicated that the alloy could not be deformed acceptably at room temperatures. Three different routes were used for the ECAE process at hot working temperatures of 200oC, 300oC and 400oC. Microstructure images showed that the primary microstructure was extremely distorted in routes A and BA while the Aluminum grain size was reduced to 200nm. Shear Punch Tests were used to evaluate the mechanical properties of prior aged specimens, ECAEed at hot temperatures with different number of passes. The tests showed an increase in the shear strength for the first pass, but ECAEing at higher temperatures were accompanied by a reduction in this property of the specimens. An increase in the deformation temperature of the material resulted in a weakening of the tensile properties of the metarial but improved the deformability of the specimens
  9. Keywords:
  10. Shear Punch Test ; Equal Channel Angular Extrusion (ECAE) ; Near Eutectic Aluminum-Silicon-Magnesium Alloy

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