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Vol.37, No.9, 1069 ~ 1081, 1999

Title

Dynamic Modulus and Internal Friction of SiCp/Al and SiCp/2024Al MMC's Processed by Vacuum Hot Pressing and Extrusion

조기현Ki Hyun Cho,이경민Kyung Min Lee,홍성길Sung Kil Hong,김영만Young Man Kim

Abstract

To shorten the processes of MMC fabrication, a number of techniques are being studied. In this study, a new process for MMC`s fabrication was developed utilizing vacuum hot pressing and subsequent extrusion. MMC`s with pure Al and 2024Al matrices reinforced with various volume fractions of SiC particulates were produced at 400℃ by vacuum hot pressing(VHP), followed by direct extrusion with extrusion ratios of 10:1 at 480℃ at constant ram speed of 2㎜/sec. The effects of extrusion pressure and relative density according to the volume fractions of the reinforcement were compared with the resultant metallurgical microstructures. Young`s moduli of the manufactured composites were measured by the sonic resonance method, damping capacity by free decay method. Measured Young`s moduli of the composites at room temperature were compared with the predictions based on Rule of Mixtures, Halpin-Tsai and Mean-field models. Measured Young`s moduli of the composites are in good agreement with the predictions based on Mean-field model. The composites reinforced with finer particles showed higher damping capacity under the same amount of SiC reinforcement.

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