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Meeting Materials Science & Technology 2019
Symposium Multifunctional Ceramic- and Metal-matrix Composites: Processing, Microstructure, Properties and Performance
Presentation Title Nanocarbon-reinforced Metal-matrix Nanocomposites
Author(s) Andrea Bachmaier, Andreas Katzensteiner, Reinhard Pippan
On-Site Speaker (Planned) Andrea Bachmaier
Abstract Scope Metal matrix nanocomposites reinforced by nanocarbon materials, such as carbon nanotubes or nanodiamonds, are very promising materials suitable for a large number of functional and structural applications. In this study, carbon nanotubes and nanodiamonds-reinforced metal matrix composites with different concentrations of the second phase were processed by two different severe plastic deformation methods. Ball milling of powder blends was used to break up the nanocarbon agglomerates. Subsequent consolidation and deformation by high-pressure torsion was performed to achieve a fully dense bulk material. As metal matrix materials nickel, silver and gold was chosen. Using high-pressure torsion deformation, further matrix grain refinement to an ultrafine grained or even nanocrystalline microstructure was achieved. The microstructure was thoroughly analyzed by electron microscopy. Particular emphasis is given to the structure of the nanocarbon reinforcement–metal interfaces and their size and distribution, which affects the deformation mechanism and thus the mechanical properties.


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