| Viscoplastic behavior of pure nanocrystalline (NC) copper subjected to a hard cyclic viscoplastic (HCV) deformation has been studied at the present work. Test specimens were fabricated by the severe plastic deformation (SPD) technique using the equal-channel angular pressing (ECAP) method. Structural features and mechanical properties of NC copper were analyzed after the treatedment at HCV deformation. Material properties and structure are shown to be influenced by heat treatment and hard cyclic deformation to a great extend. For comparison, behavior of ultra-fine grained (UFG) and coarse-grained (CG) copper under the similar conditions is presented. |
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