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The Effect of Nano Mullite, Spinel as an Additive on Aluminum Based Composite

Dargi, Hassan | 2019

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 57670 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Nemati, Ali
  7. Abstract:
  8. In this research, the additive effect of mullite and spinel nanoparticles on aluminum-based composites has been investigated in order to improve mechanical properties. Composite samples with synthesized mullite powder particles and spinel with the sizes of 80 nm and 200 microns respectively with values of (1.5, 3, 4.5) percent and spinel particles with values of (3, 6, 9) percent as phase The reinforcement, whose particles are preheated to 200°C and inside the aluminum foils, due to better wetting time with the background, was added to the background phase by the vortex casting method, and the temperature was cast at 750°C. . Then, in order to check the prepared powders and the microstructure and morphology of the particles inside the composite, X-ray diffraction test, XRD, OM analysis, FESEM, EDS, and MAP were used. Also, in order to check the mechanical properties of the composite, the hardness test and tensile test were used, and in order to check the physical properties of the density, Archimedes method was used. The results of the made composite show that the mullite particles have a good matching with the background due to the presence of alumina. The results show that by increasing the percentage of mullite up to 4.5% by volume, the hardness of the composite constantly increases, the tensile strength and formability of the substrate decreases with the increase of the mullite percentage above 3%, and it is worth mentioning that the spinel particles increase in size. Particles, their distribution in the field becomes more uniform. Because as the particles get smaller, the phenomenon of agglomeration also increases, the reason for this problem is the increase in the surface area and as a result the surface energy of the nano-sized particles increases, and by increasing the particles up to 9% by weight, we will have an increase in hardness, but the tensile strength is at 6% by weight because of this It has the ultimate breaking strength and better ductility, the highest tensile strength
  9. Keywords:
  10. Mullite ; Spinel ; Mechanical Properties ; Casting Vortex ; Aluminum Matrix Composite ; Mechanical Properties Improvement

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