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, Si
3N
4w/Al-Zn-Mg and Si
3N
4p/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 Si
3N
4w/Al-Zn-Mg composite exhibited a maximum elongation of 230 % at a strain rate of 10
-1 s
-1 and the Si
3N
4p/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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