Abstract
SiC whisker reinforced composites with Zn-22Al alloy matrix were fabricated by high pressure infiltration of the alloy melt and hot extrusion of the composite ingots eutectoid heat-treated to produce superplastic fine grain structures. Structures and mechanical properties at room temperature were examined on the obtained composites. The composites were shown to be hot-extruded under lower extrusion pressure than aluminum alloys such as 2024 and 7075. Less damage of whiskers during hot extrusion and hence a higher strengthening effect of whiskers than the composites with aluminum alloy matrix were observed. The elastic modulus and tensile strength of the Vf 20% composites at room temperature were 152 GPa and 488 MPa, respectively.
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