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| 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46094 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh, Abbas
  7. Abstract:
  8. FGM sheets with component or grain size gradient in their thickness direction provide mechanical and physical gradient properties through ND direction. FGMs are fabricated by various methods including centrifugal casting, powder metallurgy, PVD and CVD,all of which suffer from some shortcomings such as porosity of the products, low rate and high cost of production and restrictions on mass production. In this study, 2 and 4 layered Al matrix FGM sheets containing SiC and Al2O3 powders were fabricated by laminating method of Accumulative Roll Bonding(ARB). Two approaches of stacking were chosen as accumulative coupled roll bonding (ACRB) and (ASRB) for initial roll bonding and subsequent bonding of the layered sheets. Each product of these methods were introduced by FGM_b^s n,l symbol. FGM parameter is presented as a power function of the effective parameters on tensile and shear punch ultimate strengths of the products. Also, the relations of these mechanical properties and their FGM parametersare confirmed by ANN analysis and finally, emperical models are presented for prediction of the properties. OM and SEM structural analysis confirmed existence of the component gradient in the product. The UTS and USS of the products were between 163 - 203 and 147- 167 MPa ranges respectively. Best mechanichal properties were achieved for Al/SiCFGM_1^2.5 8,4which has the maximum n and c, the harder reinforcements and the less slope
  9. Keywords:
  10. Functionally Graded Materials (FGM) ; Composite Sheets ; Mechanical Properties ; Accumulative Coupled Roll Bonding (ACRB) ; Accumulative Surfacc Roll Bonding (ACRB)

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