Abstract
Through a series of experiments with preforms that had a randomly-oriented fiber distribution, the deformation of the preform and the tensile strength of the metal-matrix composites were investigated with variation of processing parameters such as the punch velocity, the amount of binder, the preform temperature, the fiber volume fraction and the applied pressure. Experimental data are presented on the injection of aluminum-alloy melts into preforms composed of δ-alumina short fibers with a silica binder. The preforms were prepared from liquid slurry using the vacuum filtration process. The base material used in this study was A12024, having poor fluidity compared with a casting aluminum alloy. Scanning electron and optical micrographs are also presented for investigating the effects of processing parameters on the microstructures of the metal-matrix composites. Recommendations are put forward concerning the optimization of the microstructure through control of the processing parameters.
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