Liang Dong, Mi Xujun, Peng Lijun, Xie Haofeng, Huang Guojie, Yang Zhen
State Key laboratory of Nonferrous Metals and Processes, GRINM Group Co., Ltd, Beijing 100088, China.
GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China.
Materials (Basel). 2020 Feb 6;13(3):732. doi: 10.3390/ma13030732.
The microstructure evolution and properties of a Cu-Cr-Ag alloy during continuous extrusion and an aging process were studied by Scanning Electron Microscope (SEM) and Transmission Electron Microscope (TEM). Owing to strong shear deformation that happened during continuous extrusion with working temperatures of 450 to 480 °C, a larger number of fine grains were obtained. Both face-centered cubic (FCC) and body-centered cubic (BCC) precipitates simultaneously existed in the matrix when aged for 450 °C for 2 h, and the Cr phases with BCC structure had an N-W relationship with the matrix. After continuous extrusion, 60% cold deformation, 875 °C × 1 h solid solution treatment, 60% cold deformation, 450 °C × 2 h aging treatment, and 70% cold deformation, the Cu-Cr-Ag alloy acquired excellent comprehensive properties: tensile strength of 494.4 MPa, yield strength of 487.6 MPa, and electrical conductivity of 91.4% IACS.
通过扫描电子显微镜（SEM）和透射电子显微镜（TEM）研究了Cu-Cr-Ag合金在连续挤压及时效过程中的微观组织演变和性能。由于在450至480°C工作温度下连续挤压过程中发生强烈的剪切变形，获得了大量细晶粒。在450°C时效2 h时，面心立方（FCC）和体心立方（BCC）析出相同时存在于基体中，且具有BCC结构的Cr相与基体呈N-W关系。经过连续挤压、60%冷变形、875°C×1 h固溶处理、60%冷变形、450°C×2 h时效处理以及70%冷变形后，Cu-Cr-Ag合金获得了优异的综合性能：抗拉强度为494.4 MPa，屈服强度为487.6 MPa，电导率为91.4%IACS。
