A nanostructured pure Cu sample consisting of nano-scale twin bundles and nano-sized grains was produced by means of dynamic plastic deformation at cryogenic temperature. The apparent activation energy for recrystallization of the nanostructured Cu was determined, being about 57kJ/mol. Interfacial diffusion of Zn in the nanostructure was investigated using secondary ion mass spectrometry at 358 to 463K, in which the volume diffusion was negligible. The A nanostructured pure Cu sample consisting of nano-scale twin bundles and nano-sized grains was produced by means of dynamic plastic deformation at cryogenic temperature. The apparent activation energy for recrystallization of the nanostructured Cu was determined, being about 57kJ/mol. Interfacial diffusion of Zn in the nanostructure was investigated using secondary ion mass spectrometry at 358 to 463K, in which the volume diffusion was negligible. The