Abstract
A newly developed compacting method for fabricating metal matrix composites was tested, in which superplastic Zn-Al alloy powders having preferable bondability and SiC fibers were used. Tensile testing of fabricated composites was carried out at 250°C. Requirements for fabricating sound SiC/SPZ composites by superplasticity applied powder metallurgical method include 410°C of fabricating temperature, 70MPa of pressure and duration for 5min. The composites have strength more than 80% of the ROM value. The heat treatment achieved for controlling properties of the composites includes initial heat treatment at 360°C for 1h and water quenching which improve the ductility and enable post-forming and second heat treatment at 250°C for 30min which recovers the high temperature strength once decreased by the initial heat treatment.
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