(1. 上海理工大学 机械工程学院 上海 200093；
2. 上海理工大学 材料科学与工程学院 上海 200093)
摘 要: 利用光学显微镜、透射电子显微镜(TEM)、维氏硬度仪和万能材料试验机对Cu-Ni-Si合金连续挤压过程中的组织演变和性能特征进行研究。结果表明：Cu-Ni-Si 合金在连续挤压过程中发生了第二相颗粒的析出，颗粒大小约为10 nm；与纯铜的连续挤压相比，Cu-Ni-Si 合金在连续挤压过程中没有发生明显的动态再结晶，因此，直角弯曲变形区可进一步划分为呈典型织构组织分布的直角弯曲前变形区和直角弯曲后变形区；各变形区的硬度值随着变形量的增加逐渐由95HV上升至194HV，并在粘着区和直角弯曲区出现明显升幅。拉伸实验结果表明：挤压前后，材料的抗拉强度由276 MPa上升至505 MPa，而塑性由22.3%下降至13.4%。
关键字: Cu-Ni-Si合金；连续挤压；组织演变；性能
（1. School of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;
2. School of Materials Science and Engineering, University of Shanghai for Science and Technology,
Shanghai 200093, China）
Abstract:The microstructure evolution and properties of Cu-Ni-Si alloy during continuous extrusion were investigated by using optical microscopy, transmission electron microscopy, micro-Vickers hardness measurement and universal- testing machine. The results indicate that the precipitation forms during continuous extrusion, the particle size is about 10 nm. Since the completed dynamic recrystallization does not occur, the right-angle bending region can further divide into before-right-angle bending region and after-right-angle bending region. With the increase of deformation, the Vickers hardness rises from 95HV to 194HV during the extrusion, and ascends significantly in adhesion region and after-right-angle bending region, respectively. The tensile test indicates that the continuous extrusion can obviously enhance the tensile strength from 276 MPa to 505 MPa, but slightly decrease the ductility from 22.3% to 13.4%.
Key words: Cu-Ni-Si alloy; continuous extrusion; microstructure transformation; property
