Production of Al-TiO2 composite layer by friction stirs processing

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Nami, Hamid | 2011

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 44247 (07)
University: Sharif University of Technology
Department: Materials Science and Engineering
Advisor(s): Kokabi, Amir Hossein; Maddah Hosseini
Abstract:
In this study, Al-TiO2 composites layer were produced on Al 1100 substrate using friction stir processing technique. The variation of process parameters such as tool rotational and substrate advancing speed as well as number of FSP passes were adjusted to achieve quite uniform dispersion of Nano-particles in the Al matrix of the fabricated surface layer. Microstructural observations were carried out using optical and scanning electron microscopes. By increasing the FSP passes, uniform distribution of TiO2 particles in the matrix improved. Surface composition layer exhibited a micro-hardness value of 49 HV which was around twice of the as-received substrate. In addition wear resistance of produced composites were higher than the Al 1100 due to lower friction coefficient. Microstructural observations by scanning electron microscopes showed that wear mechanisms of composite were oxidative wear and delamination wear
Keywords:
Aluminum ; Wear Resistance ; Titanium Oxide ; Nanocomposite Layer

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