纳米晶体Cu的室温超塑延展性

利用电解沉积技术制备出高纯度、高致密度的块状纳米Cu样品。在室温下冷轧Cu样品可得到延伸率超过 51 0 0 %的超塑延展性 ,切冷轧过程中无加工硬化效应产生。从微观结构方面研究讨论了纳米晶Cu样品的变形机制。

Superplastic Extensibility of Nanocrystalline Copper at Room Temperature

A bulk nanocrystalline (nc) pure copper with a high purity and a high density was synthesized by means of electrodeposition. An extreme extensibility (elongation exceeds 5 000%) without strain hardening effect was observed when the nc Cu specimen was rolled at room temperature. Microstructure analysis suggests that the superplastic extensibility of the nc Cu originates from a deformation mechanism dominated by grain boundary activities rather than lattice dislocation, which is also supported by the tensile creep studies at room temperature. This behavior demonstrates new possibilities for scientific and technological advancements of nc materials.