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Fabrication of Al /Al3Ti in-situ Composite by Mechanical Alloying and Two-Step Hot Press

Pelaseyed, Sogol | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41217 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Maddah Hosseini, Hamid Reza
  7. Abstract:
  8. Al /Al3Ti in-situ composite have been fabricated by mechanical alloying and two-step hot pressing of powders containing Al and 20%wt Ti. Samples were characterized by using optical microscopy, density measurement, brinel hardness, XRD analysis. An increasing density was observed with increasing pressure until certain pressure and after that the density of composite decreased, which can be attributed to the increase in the level of porosity level and the amount of forming Al3Ti. The samples that hot pressed under cycle 5 and 6, showed the most volume fraction of in-situ phases on the matrix. The wear behavior of Al based composites reinforced with in situ Al3Ti particles has been investigated on dry sliding condition by the use of pin-on-disk configuration to evaluate the wear behavior of composites under the constant applied load 10 N and 0.3 m/s in sliding distances of 500, 1000, 1500, 2000 and 2500 m. As be expected, increase the sliding distance, increase the loss volume of material. The SEM morphology of the worn surfaces and wear debris showed that three dominant mechanisms have been founded, viz (1) oxidative wear; (2) abrasive wear; (3) delaminating wear
  9. Keywords:
  10. Mechanical Alloying ; Wear ; Aluminum Matrix Nanocomposite ; Metal Matrix Composite (MMC) ; Two-Step Hot Press

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