高速铁路接触线用高强高导Cu-Cr-Co/Ti合金的组织性能研究

采用真空熔炼制备了Cu-0.50Cr-xCo合金和Cu-0.50Cr-0.07Ti合金，研究了Co含量、变形量、时效温度和合金元素Co、Ti对合金的组织性能的影响。结果表明：随着Co含量的增加，Cu基体中的晶界处逐渐出现未固溶的Cr颗粒；随着变形量的增加，Cu-0.50Cr-xCo合金的显微硬度、抗拉强度分别从129.1 HV和379 MPa增加到146.2 HV和440 MPa，分别增加了13%和16%。而电导率仅从66.8 %IACS下降到65.1 %IACS；提高Cu-0.50Cr-0.10Co合金的时效温度并不能提高合金的综合性能。在实际生产中，Cu-0.50Cr-0.10Co合金的时效温度要控制在450 ℃以下；Cu-0.50Cr-0.07Ti合金的抗拉强度和电导率分别达到450 MPa和73.1 %IACS，Ti元素的强化效果明显优于Co元素的，且对Cu-0.50Cr合金的导电性能影响更小。

Study on Microstructure and Properties of High Strength and High Conductivity Cu-Cr-Co/Ti Alloy for High-speed Railway Contact Wire

Cu-0.50Cr-xCo and Cu-0.50Cu-0.07Ti alloys were prepared by vacuum melting. The effects of Co content, deformation ratio, aging temperature and alloying element Ti on the microstructure and properties of the alloys were investigated. The results show that with the increase of Co content, undissolved Cr particles gradually appear at the grain boundary of Cu matrix. With the increase of deformation, the microhardness and tensile strength of Cu-0.50Cr-xCo alloy are increased from 129.1 HV and 379 MPa to 146.2 HV and 440 MPa, respectively, which are increased by 13% and 16%, respectively. Meanwhile, the conductivity is only decreased from 66.8 %IACS to 65.1 %IACS. Increasing the aging temperature cannot improve the comprehensive performance of Cu-0.50Cr-0.10Co alloy. During actual production, the aging temperature of Cu-0.50Cr-0.10Co alloy should be controlled below 450 °C, so that the tensile strength and electrical conductivity of Cu-0.50Cr-0.07Ti alloy can reach 450 MPa and 73.1 %IACS, respectively. The strengthening effect of Ti is better than that of Co, and it shows less influence on the conductivity of Cu-0.50Cr alloy.