| Title |
A Study on Powder Extrusion of SiC Particle Reinforced Aluminum Alloy-based Composites |
| Authors |
서병권(Byoung Kwon Suh) ; 조동철(Dong Chul Cho) ; 이지환(Chi Hwan Lee) |
| Abstract |
This paper was focused on the extrusion process of SiC_p/2024 Al composites. Aluminum powders mixed with SiC particles of 10, 20 Vol.% were degassed at 450℃ during 90min. Powder-extruded composites was extruded at 500℃ under the extrusion ratio of 25. The billet-extruded composites was extruded at 500℃ after hot pressing as a reference material. It was found that the relative density of powder-extruded composites was slightly lower than that of the billet-extruded composites. However, microhardness of the powder-extruded composites was superior to billet-extruded composites. This is attributable to the maintenance of aluminum powder property caused by short thermal-exposure time during powder extrusion process. The powder-extruded composites exhibits the lower tensile strength and elongation, comparing with billet-extruded composites. This may be due to smaller extrusion pressure, which could not be sufficiently eliminated interfacial defects such as pores. |