(1. 上海理工大學 機械工程學院 上海 200093；
2. 上海理工大學 材料科學與工程學院 上海 200093)
摘 要: 利用光學顯微鏡、透射電子顯微鏡(TEM)、維氏硬度儀和萬能材料試驗機對Cu-Ni-Si合金連續(xù)擠壓過程中的組織演變和性能特征進行研究。結(jié)果表明：Cu-Ni-Si 合金在連續(xù)擠壓過程中發(fā)生了第二相顆粒的析出，顆粒大小約為10 nm；與純銅的連續(xù)擠壓相比，Cu-Ni-Si 合金在連續(xù)擠壓過程中沒有發(fā)生明顯的動態(tài)再結(jié)晶，因此，直角彎曲變形區(qū)可進一步劃分為呈典型織構(gòu)組織分布的直角彎曲前變形區(qū)和直角彎曲后變形區(qū)；各變形區(qū)的硬度值隨著變形量的增加逐漸由95HV上升至194HV，并在粘著區(qū)和直角彎曲區(qū)出現(xiàn)明顯升幅。拉伸實驗結(jié)果表明：擠壓前后，材料的抗拉強度由276 MPa上升至505 MPa，而塑性由22.3%下降至13.4%。
關(guān)鍵字: Cu-Ni-Si合金；連續(xù)擠壓；組織演變；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
