Nanomechanical characterization of a metal matrix composite reinforced with carbon nanotubes

A new technique for the manufacture metal matrix composites has recently been developed. This technique produces a structure of a metallic matrix banded structured-layers of multiwall carbon nanotubes by a diffusive processes. To understand the increase in the volumetric mechanical properties of the composite and the dispersion of the nano-reinforcement, a nanomechanical characterization was performed by nanoindentation and atomic force microscopy. From the mechanical tests performed, a stiffness and elastic modulus maps were made near the reinforced areas, then the dispersion of the nano-reinforcements and the homogeneity of the mechanical properties were accessed. The results showed an increase in the modulus of elasticity of up to 150%; and a good dispersion of the nano-reinforcements in the reinforced zone, which demonstrates the feasibility of the alternative manufacturing process for increasing the mechanical properties of the composite. Keywords: metal matrix composites; nano-reinforcements; mechanical properties; nanoindentation; atomic force microscopy