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(guò)塑性變形獲得不同直徑的Nb/Cu復(fù)合材料線(xiàn)材, 采用納米硬度計(jì)測(cè)得其不同區(qū)域的載荷-位移曲線(xiàn), 用SEM和SPM觀(guān)察壓痕的形貌, 研究了測(cè)試位置對(duì)復(fù)合材料硬度測(cè)試結(jié)果的影響。結(jié)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(shí), 位于鈮絲、Cu-0層和Cu-1層納米復(fù)合區(qū)域的壓痕周?chē)淮嬖跇O少量堆積, 壓痕表面比較平整, 其硬度可以準(zhǔn)確地反映Nb/Cu復(fù)合材料的硬度; 另外, 隨著復(fù)合材料直徑的減小, 材料硬度呈現(xiàn)明顯的上升趨勢(shì)。