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

[ Vol. 10 , Issue. 1 ]

Author(s):

Daehwan Kim, Bonghak Seong, Guenho Van, Inshup Ahn and Sugun Lim   Pages 40 - 46 ( 7 )

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.

Keywords:

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

Affiliation:

Department of Metallical and Materials Engineering, i-Cube Center, ReCAPT Gyeongsang National University, Jinju, Korea.



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