为研发一种具有高强度和高导电性的新型电接触导线，选择Cu-2Ag-0.5Y合金为实验材料。通过连续铸造、冷拉拔和时效处理工艺制得Cu-Ag-Y合金。采用显微硬度仪、导电率测试仪、扫描电镜和透射电镜，研究了不同时效温度和时间条件下预变形合金的显微组织与性能变化规律。结果表明，经500℃/4 h时效后，Cu-2Ag-0.5Y合金获得了最佳的性能组合，其显微硬度和导电率分别为166 Hv和82.2%IACS。Cu-2Ag-0.5Y的主要强化机制为加工硬化、第二相强化或界面强化。时效处理之前的冷变形可以加速Cu-Ag-Y合金基体中第二相的析出，并提高合金的综合性能。
In order to develop a new type of electrical contact wires with high strength and high electrical conductivity, Cu-2Ag-0.5Y alloy was selected as materials. Cu-Ag-Y alloy was prepared by continuous casting, cold drawing and aging treatment. By means of the analysis of microhardness, electrical conductivity, scanning electron microscopy, and transmission electron microscopy, the aging properties and microstructures of the Cu-Ag-Y alloy were investigated at different aging temperatures and time after different cold deformation. The results show that the Cu-2Ag-0.5Y alloy has an excellent combination of microhardness and electrical conductivity aged at 500℃ for 4 h, the microhardness and the electrical conductivity reach 166 Hv and 82.2% IACS, respectively. The main strengthening mechanisms for the Cu-2Ag-0.5Y alloy are the work hardening and the second phase or interfaces strengthening. It was suggested that cold deformation prior to aging treatment can accelerate the precipitation of the second phase, and improve the comprehensive properties of the Cu-Ag-Y alloy.
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