MICROSTRUCTURES AND PROPERTIES OF NANOCOMPOSITES OBTAINED THROUGH SPTS CONSOLIDATION OF POWDERS

The microstructures and properties of copper- and aluminum-based nanoc omposites processed through severe plastic torsional straining (SPTS) consolidation of metallic micrometer powders and ceramic nanopowders w ere investigated by transmission electron microscopy (TEM), X-ray diff raction (XRD), microhardness and electrical resistivity measurements, and mechanical tests. It was shown that the SPTS consolidation of powd ers is an effective technique for fabricating metal-ceramic nanocompos ites with a high density, ultrafine grain size, and high strength. Cop per samples processed under a high pressure of 6 GPa exhibited high fa ilure strength and strain as well as unusual strain hardening. Superpl astic-like behavior was found in Al-Al2O3 nanocomposite samples.