采用下引连铸定向凝固技术制备直径为14 mm的Cu-2Ag-0.04La合金棒,再经过连续挤压获得直径为7 mm的合金丝,最后经过6道次拉拔获得直径为2 mm的合金线,研究了连续挤压及拉拔对合金组织和性能的影响。结果表明:铸态合金在连续挤压时,{001}〈100〉织构减弱并形成少量的{111}〈112〉和{110}〈112〉织构,经过拉拔后,{001}〈100〉织构基本消失,{111}〈112〉和{110}〈112〉织构增强。连续挤压态合金的抗拉强度、断后伸长率、硬度、导电率分别为270.0 MPa,31.2%,84.3 HV,93.2%IACS,拉拔后分别为566.1 MPa,4.6%,151.6 HV,88.9%IACS。

Cu-2Ag-0.04La alloy rod with a diameter of 14 mm was prepared by downward continuous casting directional solidification technology, and then was continuously extruded to obtain alloy wire with a diameter of 7 mm, and finally was drawed for 6 passes to obtain alloy wire with a diameter of 2 mm. The effects of continuous extrusion and drawing on the microstructure and properties of the alloy were studied. The results show that during continuous extrusion of the as-cast alloy, {001}〈100〉 texture was weakened, and a small amount of {111}〈112〉 and {110}〈112〉 textures were formed. After drawing, {001}〈100〉 texture disappeared, and the strength of {111}〈112〉 and {110}〈112〉 textures increased. The tensile strength, percentage elongation after fracture, hardness and conductivity of the continuously extruded alloy were 270.0 MPa, 31.2%, 84.3 HV, 93.2%IACS, respectively, and after drawing were 566.1 MPa, 4.6%, 151.6 HV, 88.9%IACS, respectively.