Interface analysis on an eutectic AlSi alloy reinforced with Ni coated MWCNT

The aim of this paper was to study the interface reaction between an AlSi alloy reinforced with Ni coated Multi-Wall Carbon Nanotubes (MWCNTs). A powder metallurgy processing route was used to produce AlSi composites. SEM, DSC, XRD and TEM analysis showed the formation of Al3Ni due to the presence of Al from AlSi matrix and Ni from CNT coating. This contributes to stress transfer from matrix to CNT reinforcement and consequently to enhancement of mechanical properties of the composites. Also it was observed some dissolution of Ni to AlSi and that the CNTs are very stable as they maintain their integrity. The coating of CNTs seems to be a good solution for application of this reinforcement in commercial alloys.