Microstructures and Mechanical Properties of CNT/AZ31 Composites Produced by Mechanical Alloying

Title:Microstructures and Mechanical Properties of CNT/AZ31 Composites Produced by Mechanical Alloying

Volume: 10 Issue: 1

Author(s): Daehwan Kim, Bonghak Seong, Guenho Van, Inshup Ahn and Sugun Lim

Affiliation:

Keywords: CNT/AZ31 alloy composites, Flakes, Hot extrusion, Mechanical alloying (MA), Rapid Solidification Process (RSP).

Abstract: 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.

Cite this article as:

Kim Daehwan, Seong Bonghak, Van Guenho, Ahn Inshup and Lim Sugun, Microstructures and Mechanical Properties of CNT/AZ31 Composites Produced by Mechanical Alloying, Current Nanoscience 2014; 10 (1) . https://dx.doi.org/10.2174/1573413709666131111225525