中文摘要：

本文采用集束拉拔技术成功制备出了Nb管增强Cu-Nb的多芯复合线材,分别对不同尺寸（Φ2.5mm、Φ2.2mm、Φ2.0mm,Φ1.7mm）线材的微观形貌进行了表征,并测试了不同尺寸线材的纳米压痕实验曲线.探究了尺寸效应下,Cu-Nb-Cu复合线材微观形貌的变化规律,及引入Nb管后,材料的界面、芯丝、及不同铜层的硬度演变规律.最后通过对Φ1.7mm线材进行高分辨场TEM测试,结果显示,线材经过大塑型变形后,完整的Nb管已经发生了破裂,呈条带状分布.

英文摘要：

Cu-Nb-Cu micro-composites with high strength and high conductivity were successfully fabricated by bundling and drawing process, and the morphology of wire with different sizes （Φ92. 5mm, Φ2. 2mm, Φ92.0ram,Φ1. 7mm） were characterized, then the nanoindentation experiments curve of wire with different sizes were tested. Under size effect, the law of morphology changes of Cu-Nb-Cu composite wire and hardness evolution of material interface, the core wire,various copper layer were explored. Finally, the wire for Φ1.7mm was tesed by TEM, the results showed that Nb tube has occurred and scattered as Bands after the large plastic deformation.