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采用水平连续定向凝固法制备了φ16 mm的Cu-2.0Ag铜杆,经多道次冷拉拔,获得了直径为0.043 mm的高强高导微细线,其抗拉强度为1062 MPa,导电率为79.12%IACS。在拉拔过程中,柱状晶组织逐步演变为纤维组织,并形成了强化银纤维。当φ16 mm杆拉拔到φ6.2 mm时,晶体取向发生偏转,少量<100>织构转变为<111>、<112>织构,等效滑移系数减少,Schmid因子减小,线材抗拉强度增强。拉拔过程中导电率下降,主要是由于纤维细化以及界面散射效果增强所致。随着形变量的增大,导电率的下降速度先增大后减小,φ16 mm杆拉拔为φ0.043 mm微细线时,导电率仅下降了11.39%IACS,仍保持较高的导电性。
The Cu-2.0Ag copper rods with diameter of 16 mm were prepared by horizontal continuous directional solidification method. After several times of cold drawing, the high strength and high conductivity fine wires with the diameter of 0.043 mm were obtained. The tensile strength was 1062 MPa and the conductivity was 79.12% IACS. In the drawing process, the columnar crystalline structure gradually evolved into fibrous tissue and formed a strengthened silver fiber. When the φ16 mm rod is drawn to φ6.2 mm, the crystal orientation is deflected. A small amount of <100> texture transforms to <111> and <112> texture, the equivalent slip coefficient decreases, Schmid factor decreases, Tensile strength increased. The reduction of conductivity during drawing is mainly due to the fiber refinement and enhancement of the interface scattering effect. With the increase of deformation, the rate of decrease of conductivity first increases and then decreases. When φ16 mm rod is drawn as φ0.043 mm fine wire, the conductivity decreases by only 11.39% IACS and still maintains the high conductivity .