Strain hardening and large tensile elongation in ultrahigh-strength nano-twinned copper

A high density of growth twins in pure Cu imparts high yield strength while preserving the capacity for efficient dislocation storage, leading to high strain hardening rates at high flow stresses, especially at 77 K. Uniform tensile deformation is stabilized to large plastic strains, resulting in an ultrahigh tensile strength of similar to1 GPa together with an elongation to failure of similar to30%. (C) 2004 American Institute of Physics.