Abstract
Very high strain rate superplasticity was observed in near-nano scale aluminum alloys. These alloy systems include the group of mechanically alloyed IN9021, IN90211, IN9052, IN905XL alloys and SiCp/IN9021 composite, an Al-14wt%Ni-14wt%Mm [Mm=misch metal] crystalline alloy consolidated from its amorphous powders and an Al-7wt%Cr-1wt%Fe alloy produced by physical vapor deposition. In each of the above alloy systems, large elongations are observed at extremely high strain rates more than 1 s−1;(labelled as positive exponent superplasticity).
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