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Vol.35, No.11, 1524 ~ 1529, 1997
Title
The Effect of Extrusion Ratio on Tensile Properties of SiCp / 2024 Al Composites Fabricated by Powder Extrusion
서병권 , 조용탁 , 김정호 , 이지환 Byoung Kwon , Suh , Yong Tak Cho , Jeong Ho Kim , Chi Hwan Lee
Abstract
The effect of extrusion ratio on the mechanical perties of the SiC_p/2024 Al composites fabricated by powder extrusion has been investigated. 2024 Al powders were mixed with SiC particles(10 and 20Vol%) and then degassed at 450℃ for 60min. The SiC_p/2024 Al composites were fabricated by powder extrusion with extrusion ratios of 15:1, 25:1, 35:1 and at 500℃ at a constant ram speed of 130㎜/min. Extrusion pressure was increased with increasing the extrusion ratio. This is die to the fact that the friction force between conical die wall and extruded billet increased and also the plastic flow stress increased. It was found that the density of the composites extruded with an extrusion ratio of 35:1 was higher than that of the composites extruded with extrusion ratios of 25:1 and 15:1. Also, the composites extruded with an extrusion ratio of 35:1 showed the highest tensile strength and elongation. This is attributable to a decrease in the porosity of the matrix and matrix/reinforcement interface and the homogeneous distribution of SiC particle in the matrix caused by an enhanced plastic flow of the 2024 Al matrix powders.
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