Microstructure Study of Mixtures of Micropowder Al and Nano Powders Tin, Sic and Al2O3 Produced by two Stage Process
Veselin Petkov (Bulgarian Academy of Sciences)
Yana Mourdjeva (Bulgarian Academy of Sciences)
Bojko Krastev (Bulgarian Academy of Sciences)
Vitaliy Bliznuk (Universiteit Gent)
Roumen Petrov (TU Delft - Team Maria Santofimia Navarro, Universiteit Gent)
Angel Velikov (Bulgarian Academy of Sciences)
Valentin Manolov (Bulgarian Academy of Sciences)
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Abstract
Composite wires obtained from aluminium shell, micron sized aluminium powder and nano - sized TiN, SiC and Al2O3 powders were fabricated by a two stage process. The stages included ultrasonic treatment and hot extrusion. TEM and SEM observations were performed to investigate the wires’ microstructure. Individual nano powder particles as well as particle agglomerations were observed by two microscopic methods, as well as nanoparticles distribution and localization in the matrix. It was found that the observed nanoparticles and clusters were in the volume of micron-sized Al particles and along the grain boundaries of the matrix. The provided EDX analysis confirms the presence of nanoparticles in the aluminium matrix. From the obtained results, it can be concluded that the two stage fabrication process of nanocomposite wires leads to better wetting of the nano powders from the aluminium melt. Nanocomposites obtained by mixing and extruding TiN, SiC and Al2O3 nano powders and Al micro powders can be used as modifiers of aluminium alloys, as the nanoparticles will contribute to grain refinement and will participate as additional crystallization centers.