形变Cu-Cr-Ag原位复合材料组织和性能

Microstructure and Properties of Cu-Cr-Ag in-situ Composites

摘要:

采用熔铸-中间热处理-形变工艺制备了形变Cu-7Cr及Cu-7Cr-0.07Ag原位复合材料，利用光学显微镜、扫描电镜、数字微欧计及液晶电子拉力试验机研究了Cu-7Cr及Cu-7Cr-0.07Ag合金的微观组织、力学性能和导电性能。结果表明，微量Ag的加入使Cu-7Cr合金铸态组织枝晶臂直径更小，相同应变量下形成的纤维更加细小均匀，材料的强度显著提高，电导率略有上升，延伸率小幅提高

关键词:微量Ag添加;原位复合材料;微观组织;力学性能;电导率

Abstract:

Cu-7Cr and Cu-7Cr-0.07Ag in-situ composites were prepared by the cast and thermo-mechanical treatment process. The microstructure, mechanical properties and conductivity of the in-situ composites were investigated by optical microscope, scanning electronic microscope, tensile-testing machine and microhmmeter. Results indicate that the trace addition of Ag can refine primary Cr dendrites and deformed Cr fibre, which leads to a significant increase in strength and slight improvement in conductivity. At the same time, the Cu-7Cr-0.07Ag in-situ composite shows a little higher plasticity

Key words:trace Ag addition; in-situ composite; microstructure; mechanical property; conductivity