발간논문

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Vol.35, No.4, 477 ~ 482, 1997
Title
A Study on Powder Extrusion of SiC Particle Reinforced Aluminum Alloy-based Composites
서병권 , 조동철 , 이지환 Byoung Kwon Suh , Dong Chul Cho , 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.
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