Superplastic extensibility of nanocrystalline copper at room temperature

A bulk nanocrystalline (nc) pure copper with high purity and high density w as synthesized by electrodeposition, An extreme extensibility (elongation e xceeds 5000%) without a strain hardening effect was observed when the ne co pper specimen was rolled at room temperature. Microstructure analysis sugge sts that the superplastic extensibility of the ne copper originates from a deformation mechanism dominated by grain boundary activities rather than La ttice dislocation, which is also supported by tensile creep studies at room temperature. This behavior demonstrates new possibilities for scientific a nd technological advancements with ne materials.