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Characterization of nanocomposites based on Al- alloy and multiwall carbon nanotubes prepared by industrial High Pressure Die Casting method

Further development of the transport industry is based on two main goals, finding of new lightweight materials with changed mechanical properties and the adoption of environmentally friendly technologies. Materials showing great potential through changed and targeted mechanical properties are nanocomposites based on a polymer matrix or metal [1, 2]. Use of nanocomposites in parts production could result in a reduction of part dimensions, and eventually on a weight of a final part. Aluminium alloys are used massively in the vehicle parts production manufacture, so the possibility for preparation of nanocomposites based on aluminum alloy AlSi9Cu3(Fe) and multiwall carbon nanotubes (MWCNTS) by the High Pressure Die Casting method (HPDC) was investigated. Nanocomposite samples were prepared on industrial HPDC machine Buhler 42D by placing MWCNTs before piston and directly in the tool with a different ratios 0.05, 0.1 and 0.2 wt. %. Degradation of MWCNTs introduced in Aluminium alloy at 690°C did not occurred that was confirmed by a scanning electron microscopy. Microstructural, metallographic and mechanical properties were studied by an optical microscope and universal testing machine. Nanocomposites with 0.05 wt.% MWCNTs placed before a piston showed finest microstructure, with smaller primary grain size of Al, that was in a correlation with the mechanical testing results, increased elongation at break and tensile strength.

Nanocomposite ; Al-aloy ; Multiwall Carbon Nanotubes ; High Pressure Die Casting

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