Chosen properties of aluminium-silicon carbide particles composite obtained by extrusion of powder compacts
Marek Wojtaszek, Stefan Szczepanik Akademia Górniczo-Hutnicza, Wydział Metalurgii i Inżynierii Materiałowej, al. Mickiewicza 30, 30-059 Kraków
Annals 3 No. 8, 2003 pages 415-420
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abstract Metal-based composites are mainly produced by casting or by powder metallurgy route. In this work the results of the research on manufacturing the materials obtained by extrusion of water atomized RAl-1 aluminium powder compacts at 500°C and composites based on this powder, containing 2 and 5 vol.% silicon carbide are presented. Influence of chemical composition and reduction ratio during extrusion on density, structure changes and chosen mechanical properties was investigated. As the result, highly densified material was produced (Fig. 2a). It was found that strengthening phase (SiC) lowered the density of composite materials. Their mechanical properties depend on amount of silicon carbide particles. Composite material containing 5 vol.% silicon carbide, formed with extrusion ratio of 13.32, exhibited better mechanical properties than matrix material (aluminium). By introducing 2 vol.% silicon carbide particles into aluminium matrix it was possible to almost double decrease of volume loss of the material during wear resistance tests. Greater amount of strengthening phase did not cause this phenomenon. Key words: aluminium powder, SiC particles, composite, extrusion