Cu/Nb composite wires in different diameters were obtained through plastic deformation. Load-displacement curves were tested during nano-indentation test on different regions of the Cu/Nb composite wires. The characteristic of the indents was observed by scanning electron microscopy (SEM) and scanning probe microscopy (SPM). The influence of test region on the hardness of the composite wires was investigated. The results show that the ratio of the final displacement after complete unloading to the displacement at peak load (hf/hmax) was smaller than 0.8, very little pile-up and smooth surface around the indents were found in the nano-composite region of Nb core, Cu-0 and Cu-1 layers. The hardness of this region reflected the hardness of Cu/Nb composite accurately. Moreover, the hardness of the composite increased with the diameter of Cu-Nb wire decreasing.

通過塑性變形獲得不同直徑的Nb/Cu復合材料線材, 采用納米硬度計測得其不同區域的載荷-位移曲線, 用SEM和SPM觀察壓痕的形貌, 研究了測試位置對復合材料硬度測試結果的影響。結果表明: 卸載后的壓痕深度與zui大壓痕深度的比值(hf/hmax)不大于0.8時, 位于鈮絲、Cu-0層和Cu-1層納米復合區域的壓痕周圍只存在極少量堆積, 壓痕表面比較平整, 其硬度可以準確地反映Nb/Cu復合材料的硬度; 另外, 隨著復合材料直徑的減小, 材料硬度呈現明顯的上升趨勢。