Microstructures and Mechanical Properties of CNT/AZ31 Composites Produced by Mechanical Alloying
In this study, the mechanical properties and hot extrusion of carbon nanotubes (CNTs)-reinforced Mg (AZ31) based composite
were investigated. To improve the mechanical properties of the Mg alloy AZ31, CNT /AZ31 composites were fabricated by mechanical
alloying and hot extrusion process. Then, extrudates of these composites were formed using a hot-extrusion process. The conditions to
prepare the extruded specimens, which were rod-shaped, were at extrusion temperature of 400 °C, an extrusion ratio of 19:1, and a ram
speed of 1.0 mm/s. A 300 ton press was used for an extrusion. The microstructures were observed using by optical microscopy (OM),
scanning electron microscopy (SEM), and energy-dispersive spectroscopy (EDS). The characterization of the hot-extruded CNT/AZ31
rods was performed through electrical resistance and tensile test. The extruded CNT/ AZ31 rods showed significantly improved ultimate
tensile strengths and yield strengths, but the exhibited an elongation of less than 2%. These results were due to the formation MgO between
Mg and the CNTs during themechanical alloying process.
Keywords: CNT/AZ31 alloy composites, Flakes, Hot extrusion, Mechanical alloying (MA), Rapid Solidification Process (RSP).
Rights & PermissionsPrintExport