摘要
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。该样品经室温下冷轧,延伸率可高达5100％,且冷轧过程中无加工硬化效应产生。微观结构分析表明纳米晶体 Cu 的变形机制是由晶界运动来控制而非普通粗晶体材料的位错运动机制。这一发现有力地证明了纳米晶体材料具有与普通多晶材料完全不同的力学行为,并为深入理解纳米材料的结构性能关系及拓展纳米材料的工业应用开辟了新路。
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 5000%)without strain hardening effect was observed when the nc Cu specimen was rolled at room temperature.Microstructure analysis suggests that the super plastic 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.
出处
《材料导报》
EI
CAS
CSCD
2001年第4期56-58,共3页
Materials Reports
基金
中国科学院创新基金及国家自然科学基金
关键词
纳米晶
室温冷轧
超塑延展性
铜
电解沉积
nanocrystalline Cu
cold roiling at room temperature
superplastic extensibility
