Flaw-free bulk Cu specimens with a high density of nano-scale mechanical twins were produced by means of dynamic plastic deformation at liquid nitrogen temperature. The nano-twinned Cu exhibits a tensile yield strength of 600 MPa and an elongation-to-failure of 11 %. The significant strengthening originates from the effective blockage of glide dislocations by numerous twin boundaries and dislocations. (c) 2005 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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