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New types of carbon fiber-reinforced aluminum alloys, in which whiskers and fine particulates of silicon-carbide were distributed among the fibers, were prepared by a squeeze casting process, using a low cost high strength type carbon fibers. The mechanical properties and fracture morphologies of the composites were investigated by the three-point flexural tests with acoustic emission measurements.The results obtained are as follows.In the conventional composites, the longitudinal flexural strength was very low and the failure of the fibers initiated mainly at the point of direct fiber-to-fiber contacts. On the other hand, the longitudinal flexural strength of the hybrid composite was about 50% higher than that of the conventional composites. In the hybrid composites, the fibers were separated by whiskers and particulates. The failure occurred after accumulation of microcracks of fiber break.

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