Abstract
Recently, there has been a growing interest in the development of fine-grained microstructures for superplastic forming of aluminum alloy matrix composites. In the present paper, Si3N4w/Al-Zn-Mg and Si3N4p/Al-Zn-Mg composites were processed by a powder metallurgy route and constant true strain rate tensile tests were carried out in a wide strain rate range from 10-4 to 100 s-1 at 818 K in order to investigate superplastic properties of both composites.The Si3N4w/Al-Zn-Mg composite exhibited a maximum elongation of 230 % at a strain rate of 10-1 s-1 and the Si3N4p/Al-Zn-Mg composite showed a maximum elongation of 330 % at a higher strain rate of I s-1. Thus, the Al-Zn-Mg alloy matrix composites exhibited superplastic behavior at high strain rates (>10-1 s-1).
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