中文摘要：

对铸态组织采用高温700℃，2h＋720℃，2h退火及低温450℃，10h退火再进行冷拉拔，制备了Cu-12％Ag（质量分数）合金线材，通过观察退火前后显微组织及测定不同冷拉拔变形程度下合金的强度和电导率，研究了预备热处理工艺对纤维相复合强化Cu-Ag合金组织与性能的影响。高温退火能够充分消除枝晶偏析，减少共晶体数量并促进较粗大的次生相析出，使合金中溶质及相界面的电子散射效应较小。低温退火能够部分消除枝晶偏析，保持一定数量的非平衡共晶体及促进细小的次生相析出，使合金中分散相强化效应较明显。在相同的变形程度下，低温退火可使合金具有较高的强度，高温退火可使合金具有较高的电导率。Cu-12％Ag合金采用高温退火的预备热处理工艺可以得到更优良的综合性能。

英文摘要：

The as-cast Cu-12%Ag （mass fraction）alloy was pre-annealing treated either at the high temperature 700℃ for 2 h followed by 720℃ for 2 h or at the low temperature 450℃ for 10 h. The composite wires were prepared by drawing the annealed alloy at ambient temperature. The effect of the pre-annealing treatment on the properties of a Cu-Ag microcomposite with middle Ag content was investigated by observing the microstructure and measuring the tensile strength and electrical conductivity. The pre-annealing treatment at the high temperature will eliminate the dendritic segregation more completely in Cu matrix, reduces the volume fraction of eutectic colonies and induces the precipitation of coarse secondary particles, which can result in a low level of electron scattering at solute atoms and phase interfaces. The pre-annealing treatment at the low temperature will eliminate the dendritic segregation partially, reserves some of non-equilibrium eutectic colonies and induces the precipitation of fine secondary particles, which can result in a high level of dispersion strengthening. There is higher tensile strength for the alloy pre-annealed at the low temperature and higher electrical conductivity for the alloy pre-annealed at the high temperature under the condition of certain draw deformation. In general, the pre-annealing treatment at the high temperature can obtain better matched relationship between strength and conductivity in the microcomposite compared with that at the low temperature.