Effects of Carbon Nanotube Ratio on Mechanical and Morphological Properties of A356-Carbon Nanotube Composites

Abstract

In this study, CNT-A356 composites were obtained by reinforcing an aluminium alloy A356 matrix with 4 different ratios (0.5, 1, 1.5 and 2%) of carbon nanotubes, and hardness, wear and microstructure properties of these composites were investigated. Powder metallurgy method was used for producing composites. A356 powders and CNTs were mixed via ball milling for 1 h, and cold pressed in powder pressing mold. After that, mold was taken into a functional furnace, and hot pressing operation was carried out. Pressed bulk was sintered in a vacuum atmosphere (10 −6 mbar) at 550 • C for 1 h. Hardness measurements, wear tests, and microstructure analyses of produced samples were performed. As a result of experimental studies, CNTs were observed to be located as agglomeration among matrix grains, and a more hollow structure was formed by increasing CNT ratio. Moreover, weight loss increased as hardness values decreased when CNT ratio exceeded 1%. The highest hardness value was measured in composite with 1% CNT.

Analytical and Numerical Investigation of Elastic Stresses in Thermoplastic Matrix Composite Discs Under Temperature Effect

“…εr refers to the radial deformation, ε θ refers to the tangential deformation. Strain-stress relation [12];…”

“…Using the finite element method, it was concluded that the stress components occurring in the layers of the material are lower than those on the lower and upper surfaces, and there is an increase in the plastic stress components depending on the number of iterations [7].The behavior of composite materials against high temperatures is different from each other. In different studies, the mechanical properties and thermal behavior of different composite materials were investigated [8][9][10][11][12].…”