通过拉伸试验和四点测电阻法,对中心含额外纯Cu的Cu-Nb复合线材的力学及导电性能进行测试,并利用SEM观察其微观结构和断口形貌.结果表明:从断口中心到边沿,断裂方式从正断逐渐转向剪切断裂.中间纯Cu有利于导电性和强度的优化.线材的强度随着Nb芯丝间距的减小呈指数上升趋势.当间距小于100 nm时,尺寸效应对强度有显著影响,且77 K下强度随间距减小而增大的速度大于室温下强度随间距减小的速度.而当间距大于300 nm时,尺寸效应对强度的贡献很小.
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