Abstract
The superplastic behavior of a powder metallurgy (PM) back-extruded tube of 6061 Al-20% SiC W composite was investigated under thermal cycling conditions. Newtonian flow behavior is observed resulting in extraordinarily high elongations (> 1000%). Special attention was paid to the distribution and orientation of whiskers in the aluminum matrix and their influence on the deformation process of the composite. The ellipticity developed during deformation on the originally round samples was found to be stress-dependent and was attributed to the initial whisker-distribution.
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