Journal of Advanced Materials and Technologies

Journal of Advanced Materials and Technologies

Evaluation of Microstructure and Mechanical Properties of Ti-Al2O3 Nano-Composites Fabricated by Friction Stir Processing

Document Type : Original Reaearch Article

Authors
Aziz Shafiei-Zarghani
Sayed Farshid Kashani Bozorg
University of Tehran, School of Metallurgy and Materials Engineering, Center of Excellence for Surface Engineering and Corrosion Protection of Industries, Tehran, Iran
10.30501/jamt.2636.70286
Abstract
Ti/Al2O3 nano-composites were fabricated using friction stir processing. In order to achieve nanocomposites with different volume fraction and size of reinforcements, the rotating tool was travelled on the substrates along the grooves with various widths that were filled with 20 or 80nm sized Al2O3 powders. Nano-composites with Al2O3 volume fraction of 1.8 to 5.7% were resulted. Optical and transmission electron microscopy showed that the most effective factor on refining matrix grain size is the inter-reinforcements distance or in other words their volume fraction and dispersion. In addition, microstructural characterization and micro hardness and mechanical testing revealed that in addition to reinforcements, reduction of matrix grain size and interactions related to reinforcements/subgrain features such as grain boundaries and dislocations are responsible for the enhancement of mechanical properties of the fabricated nano-composites.
Keywords
Friction stir processing
Ti
Alumina
Nano-composite
Microstructure
Mechanical properties
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Journal of Advanced Materials and Technologies
Volume 4, Issue 1
Spring 2015
Pages 1-11

  • Receive Date 12 September 2014
  • Revise Date 04 April 2015
  • Accept Date 30 May 2015