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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。
The deformed Cu-7Cr and Cu-7Cr-0.07Ag in-situ composites were prepared by means of melt casting-intermediate heat treatment-deformation process. The properties of Cu-7Cr and Cu-7Cr-0.07Ag composites were investigated by optical microscope, -7Cr-0.07Ag alloy microstructure, mechanical properties and electrical conductivity. The results show that with the addition of trace Ag, the diameter of dendritic arm of the as-cast Cu-7Cr alloy is smaller and the fibers formed by the same strain are more fine and uniform, the strength of the material is significantly increased, the conductivity is slightly increased, and the elongation is slightly increased.