Size Effect of High-Strength and High-Conductivity Cu-Nb Microcomposites

作者：Liang Ming; Xu Xiaoyan; Wang Pengfei; Jiao Gaofeng; Li Chengshan^*; Zhang Pingxiang

来源：Rare Metal Materials and Engineering, 2017, 46(3): 699-703.

• Cu-Nb
• high strength
• high conductivity
• nano-indention hardness

High strength and high conductivity Cu-Nb microcomposites possess nano-structured Nb fibers and pure Cu matrix. Mechanical properties affected by size effect change regularly. The changing rule of strength with the size of Nb filaments was analyzed by stress-strain measurements with different diameters. The characteristics of elastic modulus and nano-indention hardness varying with the thickness of Nb filaments were investigated by a nanoindentation method. Results show that the measured value of strength is considerably higher than that obtained by ROM and the UTS of Cu-Nb increases exponentially with the decreasing of dm. Moreover, the nano-indention hardness of Nb filaments also increases greatly as the size decreases. It is believed that electronic interface scattering associated with the mean free path of the electrons dominates Cu-Nb conductivity.

• 出版日期2017-3
• 单位西北有色金属研究院