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高强度高电导Cu-Nb微观复合材料具有纳米结构的Nb芯丝和纯Cu层,材料的尺寸效应促使力学性能呈规律变化。通过不同线材尺寸的应力应变曲线测试研究了材料强度随内部Nb芯丝尺寸的变化规律,通过纳米压痕手段分析了材料弹性模量和纳米压痕值随随材料尺寸的变化特征。结果表明,材料的强度实测值远大于混合定律计算的理论值,且随Nb芯丝尺寸的减小强度呈指数增加,Nb芯丝纳米硬度值也随尺寸的减小显著增加。与电子自由程相关的界面电子散射作用是影响材料电导的主要因素。
The high strength and high conductivity Cu-Nb micro-composite material has the nanostructured Nb core wire and pure Cu layer. The size effect of the material promotes the regular change of the mechanical properties. The variation of material strength with the internal Nb core wire size was tested by the stress-strain curve test of different wire sizes. The characteristics of material elastic modulus and nanoindentation value with the size of the material were analyzed by means of nanoindentation. The results show that the measured values of the strength of the material are much larger than the theoretical values calculated by the mixing law and increase with the decrease of the size of the Nb core wire. The interface electron scattering associated with the free path of electrons is the main factor that affects the conductance of the material.