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Production and Characterization of AA5083 Aluminium Sandwich Sheet with Porous (FOAM) Core by Accumulative Roll Bonding

Mozaffari, Mohammad Amin | 2017

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 49623 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh, Abbas
  7. Abstract:
  8. In this research, aluminium sandwich structure was manufactured by accumulative roll bonding (ARB). In this method, aluminum AA5083 strip was used as the matrix and titanium hydride was selected as the foaming agent powder. Due to the use of particle foaming agent in the first pass, reduction, preheat temperature, rolling speed and the percentage of powder particles parameters were examined. Finally, the 66% reduction, 400 °C preheat temperature and 25 rpm rolling speed, were considered as the optimal values. At the next stage of this process 50% reduction was applied at each pass and this process was repeated up to five passes. After ward, in order to create a sandwich structure, aluminum composite sheets were covered with AA5083 by cladding. Then, the effects of time, temperature and amount of foaming agent were studied. Archimedes density test was utilized to measure the porosity. Laser flash test was used for measuring the thermal conductivity. For evaluation of mechanical properties, three-point bending and shear punch tests were carried out. At optimal conditions, 610 °C foaming temperature took 10 minutes with 0.5% foaming agent for production of the sandwich plate with porous core. Porosity was considered as 25%. Thermal conductivity dropped 34% for the sample with 22% porosity. In three-point bending and shear punch tests, the bending force and the shear strength decreased with increasing porosity
  9. Keywords:
  10. Accumulative Roll Bonding (ARB) ; Aluminum Alloy 5083 ; Aluminum Sandwich Sheet ; Porous Core (foam)

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