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Using ARB Process for Metal Matrix Foam and Composite Production

Khalkhali, Mohammad | 2009

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 39131 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Akbarzadeh, Abbas
  7. Abstract:
  8. Metal matrix composites (MMC) and metal foams (MF) have been the topic of numerous researches during the last decades. The appropriate mechanical and physical properties of these materials make them useful in various industries. In this research, a unique approach is introduced for producing MMCs and MFs in which accumulative roll bonding (ARB) is employed in order to achieve a homogeneous distribution of ceramic particles in the metal matrix. Also, foamed structures can be made by subjecting Al/TiH2 composite to an appropriate annealing heat treatment where TiH2 particles decompose to hydrogen and titanium. In this work, the effect of number of ARB cycles on the size and distribution of particles is investigated by analytical microscopy. Various mechanical and physical tests are utilized to evaluate the effect of process parameters on the mechanical properties and porosity distribution of specimens. It is observed that increasing in the number of ARB cycles leads to a remarkable decrease in the size of TiH2 particles from 45 μm to 10 μm, while the size of SiC particles remains approximately the same. Also, it is observed that not only the quality of interfaces, containing external particles, is improved, but also distribution of the size and shape of porosities in the MF is homogenized by increasing the number of ARB cycles. Furthermore, there is a considerable rise in the yield stress, the UTS and hardness of Al/SiC composites compared with the Al sheets. It is observed that due to morphological anisotropy of reinforcing particles, the strength of the specimens in rolling direction is grater than that of transverse direction
  9. Keywords:
  10. Metal Matrix Composite (MMC) ; Aluminum ; Metal Foam ; Accumulative Roll Bonding (ARB) ; Silicon Carbide ; Titanium Hydride

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