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“Production of Micro and Nanocomposites of Fe3Al/ZrO2 Via Mechanical Alloying and Surveying of Mechanical Properties”

Karbalaei Hassan Kashani, Ashkan | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40302 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Pourazarang, Kazem; Salahi, Esmail
  7. Abstract:
  8. In this investigation, nanostructure Fe3Al was produced by mechanical milling initially. Pure iron and aluminum powders were milled with suitable ratio 86Fe-14Al by weight. Milling was done up to 120 h times and with BPR 10 and BPR 20. Morphological changes, powder density and size, phase and structural changes, grain size and lattice strain were characterized by X-ray diffractometry (XRD), scanning electron microscopy (SEM) and laser particle size analyzer (LPSA). 40 h mechanical alloying with BPR 20 led to the corresponding intermetallic compound, Fe3Al with a nanocrystalline structure. Therefore Fe3Al/ZrO2 micro and nanocomposite powders were synthesized with manufactured by milling of Fe3Al and PSZ with Volume percent of 5, 10, 15 and 20 (μm size) and 5 (nm size). The samples were two step sintered in T1=1200°C and T2=1050°C. Relative density of the samples was 0.90 to 0.95. Furthermore grain size of the samples was less than 100 nm. Room temperature compressive strength and three point bending strength of the samples were investigated. According to tetragonal to monoclinic zirconia transformation, mechanical properties of composites were improved with enhancement of PSZ proportion
  9. Keywords:
  10. Tron Aluminide ; Mechanical Milling ; Partially Stabilized Zirconia (PSZ) ; Nanocomposite ; Two Step Sintering ; Compression Strength ; Tree Point Strength

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