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Macrostructure and Mechanical Properties of Structural Composite of Aluminum and Stainless Steel Net Processed by Casting and Rolling

Keshavarz Kermani, Ali | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48617 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh, Abbas
  7. Abstract:
  8. Having the high strength to weight ratio has been made the composites special materials very important these days. The low density of aluminum and its appropriate corrosion properties make it a good choice for metallic matrix. Also, the high tensile strength of stainless steel fibers can helps as a reinforcement in the composite to improve its mechanical properties. Enhancing the bonding of composite’s components can helps it to develop its properties. Casting is an appropriate process for making an aluminum matrix containing steel fibers as reinforcement in a structural composite. In addition, rolling process can remove so many defects made by casting, and improve joining of fibers and matrix.In this project, effect of annealing temperature, size of meshing, reduction in thickness, and geometrical heterogeneity of aluminum matrix has been investigated. Furthermore, tensile strength and total elongation of the structural composite have been compared to non-composite roll-bonded aluminum sheet. Also, so many changes in mechanical properties, micro and macro structure of the composite has been investigated.Results show that hot rolling has good influence on making a fine grain structure in the aluminum matrix. Therefore, the tensile and yield strength of the composite has been improved. Also, it is shown that increasing the annealing temperature from 400˚c to 500˚c has made smaller grains in the aluminum matrix, so the tensile strength of the structural composite becomes higher. Finally, the higher value of geometrical heterogeneity of the aluminum matrix has enhanced the total elongation of the structural composite, because it make a delay in diffused necking in the structural composite
  9. Keywords:
  10. Mechanical Properties ; Casting ; Aluminum Matrix Composite ; Steel Mesh ; Microstructure ; Structural Composite

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