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A cost effective method was introduced to fabricate pure aluminum matrix composites reinforced with 20% volume fraction of 3.5μm SiC particles by squeeze casting followed by hot extrusion.In order to lower volume fraction of the composites,a mixed preform containing pure aluminum powder and the SiC particles was used. The suitable processing parameters for the infiltration of pure aluminum melt into the mixed preform are: melt temperature 800℃,preform temperature 500℃,infiltration pressure 5 MPa,and solidification pressure 50 MPa.Microstructure and properties of the composites in both as-cast and hot extruded states were investigated.The results indicate that hot extrusion can obviously improve the mechanical properties of the composite.
A cost effective method was introduced to fabricate pure aluminum matrix composites reinforced with 20% volume fraction of 3.5 μm SiC particles by squeeze casting followed by hot extrusion. Order to lower volume fraction of the composites, a mixed preform containing pure aluminum powder and the SiC particles was used. The suitable processing parameters for the infiltration of pure aluminum melt into the mixed preform are: melt temperature 800 ° C, preform temperature 500 ° C, infiltration pressure 5 MPa, and solidification pressure 50 MPa. Microstructure and properties of the composites in both as-cast and hot extruded states were investigated. The results indicate that hot extrusion can obviously improve the mechanical properties of the composite.