(1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室，兰州 730050；
2. 兰州理工大学 材料科学与工程学院，兰州 730050；
3. 大连理工大学 三束材料改性教育部重点实验室，大连 116024)
摘 要: 采用光学显微镜(OM)、扫描电子显微镜(SEM)、万能材料试验机、涡流金属电导仪等分析技术研究了30%、60%、90%变形量轧制与(450 ℃, 1 h)时效处理对Cu-1.0Cr-0.1Zr合金组织和性能的影响。结果表明：Cu-1.0Cr-0.1Zr合金经适当的冷变形和时效处理，其力学性能和导电性能都显著提高，在90%冷变形+(450 ℃, 1 h)时效后的综合性能最好，其抗拉强度、屈服强度、硬度、伸长率和导电率分别达到411.7 MPa、364.69 MPa、127.6 HV、25.72%和63.7%IACS。通过显微组织分析和理论计算可知，时效处理后，第二相的弥散析出是该合金获得高强度的重要原因，同时合金元素大量析出，使导电主体(Cu基体)中固溶原子减少，进而获得了较高的导电率。
关键字: Cu-Cr-Zr合金；轧制；时效；微观组织；力学性能；导电性能
（1. State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China;
3. Key Laboratory of Materials Modification by Laser, Ion and Electron Beam, Ministry of Education, Dalian University of Technology, Dalian 116024, China）
Abstract:The effects of rolling with 30%, 60% and 90% deformation and aging treatment at 450 ℃ for 1 h on the microstructure and properties of Cu-1.0Cr-0.1Zr alloy were investigated by optical microscope (OM), scanning electron microscope (SEM), universal material testing machine, and eddy current metal conductivity instrument. The results show that the mechanical properties and electrical conductivity of Cu-1.0Cr-0.1Zr alloy are significantly improved after proper cold deformation and aging treatment. The comprehensive performance are the best after 90% cold deformation+(450 ℃, 1 h) aging, and the tensile strength, yield strength, hardness, elongation and electrical conductivity are 411.7 MPa, 364.69 MPa, 127.6 HV, 25.72% and 63.7%IACS, respectively. From the microstructure analysis and theoretical calculation, it is known that the dispersion precipitation of the second phase is an important reason for the high strength of the aged alloy, simultaneously, the large amount of precipitation reduces the number of solutes in the conductive main body (Cu matrix), and then higher conductivity is obtained.
Key words: Cu-Cr-Zr alloy; rolling; aging; microstructure; mechanical property; electrical conductivity
