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A new method for fabrication of in situ Al/Al3Ti-Al2O3 nanocomposites based on thermal decomposition of nanostructured tialite

Azarniya, A ; Sharif University of Technology | 2015

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jallcom.2015.04.145
  3. Publisher: Elsevier Ltd , 2015
  4. Abstract:
  5. In this research, the possibility that nanostructured aluminium titanate (tialite) powder can be used as a chemical source for producing Al2O3 and Al3Ti precipitates in aluminium matrix composites has been investigated. Optical microscopy, FE-SEM, XRD, DSC and TGA examinations were used to characterize the synthesized specimens. The results showed that a porous structure and inferior mechanical properties were obtained in as-sintered samples. The further thermomechanical treatments i.e. cyclic rolling and hot extrusion improved the mechanical properties and led to a dense microstructure with a homogeneous distribution of Al2O3 and Al3Ti reinforcements. In rolled composites, the morphology of both reinforcers were blocky, but in hot extruded samples, the Al3Ti particles had a sub-micron rod-like structure and Al2O3 particles had a nano-sized distribution with an average particle size less than 100 nm within the nano-grained matrix
  6. Keywords:
  7. Aluminium matrix composite ; Aluminium titanate ; Nanocomposite ; Thermal decomposition ; Thermomechanical processes ; Decomposition ; Hot rolling ; Mechanical properties ; Nanocomposites ; Particle size ; Pyrolysis ; Sintering ; Thermomechanical treatment ; Titanium ; Titanium compounds ; Aluminium matrix composites ; Aluminium titanate ; Average particle size ; Chemical sources ; Homogeneous distribution ; Porous structures ; Rod-like structures ; Thermomechanical process ; Aluminum
  8. Source: Journal of Alloys and Compounds ; Volume 643 , 2015 , Pages 64-73 ; 09258388 (ISSN)
  9. URL: http://www.sciencedirect.com/science/article/pii/S092583881501169X