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Study on Hot Extrusion of AA2017-10%SiCp

Ranjbar Motlagh, Sasan | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45686 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Serajzade, Siamak
  7. Abstract:
  8. In this study, hot extrusion of AA2017-10%SiC¬p composite during deformation process and effect of deformation parameters on mechanical properties have been investigated. At the first step, hot compression tests have been carried out to obtain the flow behavior of the material at different temperatures and strain rates. The activation energy of hot deformation was calculated 296 Kj/mol. In the next step, by using a finite element model in ABAQUS software and the results of uniaxial hot compression test behavior of AA2017 and AA2017-10%SiC¬p during hot and warm extrusion have been investigated. By using it temperature gradient and velocity field and strain distribution were predicted. In the final step the effect of extrusion parameters such as initial temperature, velocity and extrusion ratio on mechanical properties of extruded composite were studied. By using experimental investigations such as metallography by optical and electron microscopy, uniaxial compression test and Vickers hardness revealed that composite strength at temperature above 150˚C is more than AA2017 alloy and at 180˚C and 3.24 extrusion ratio rises up to 480 MPa due to dynamic strain aging in this temperature range. Hardness results indicate the increased hardness of the composite area is in contact with the mold to 150 Vickers.
    Results show that by adding SiC particles, Dynamic strain aging occurs in the temperature range higher than AA2017 alloy. It was also found that the presence of SiC particles increase the fraction of recrystallization compared to non-reinforce alloy
  9. Keywords:
  10. Finite Element Simulation ; Strain Distribution ; Tempreture Distribution ; Hot Extrusion ; Metal Matrix Composite (MMC) ; Aluminum Matrix Composite

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