production of Nickel- Aluminide Nanocomposite Reinforced  with Al2O3 Nanoparticles Via Mechanical Alloying Route  and Field Activated Sintering Technique

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Sagharichi, Masoumeh | 2012

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 43634 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Abachi, Parvin; Pourazarang, Kazem
Abstract:
Nickel aluminides are intermetalics with complex structures that have high metlting points. However, brittlement at room temperature and low high_temperature strength (above 700 ̊C) can be mentioned as their short comings. Nowadays, many efforts have been proceeded to produce theirs composites, so that one can benefit from ceramics and intermettalics properties simultaneously. In this project, the main was aim to produce NiAl matrix nanocomposite reinforced with Alumina Al2O3. The composite is processed using milling and mechanical alloying. This is a good way to produce intermetallics and their composites with high melting points without any need to supply high temperature during production. At first Al and Ni powders were mixed for 1 hour to have homogeny Mixture. the NiO was selected as oxidant, and after milling of Ni, Al, NiO powders at final step, NiAl and Al2O3 particles was produced. The powders were electrical field activated sintered (FAST) to produce cylindrical samples with diameter of 11mm and average height of 14mm. Microstructure assessments of nanocomposite and its analyses were provided using XRD, DSC, SEM, EDX and TEM.
Keywords:
Mechanical Alloying ; Nickel-Alumina Nanocomposite ; Alumina Particles Reinforcement ; Electrical Field Activated Sintering

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