形变Cu­15Cr­Ce原位复合材料的组织和性能

摘要

采用熔铸-中间热处理-形变工艺制备形变Cu­15Cr及Cu­15Cr­0.05Ce原位复合材料。利用光学显微镜、扫描电镜、液晶电子拉力试验机以及往复摩擦磨损试验机研究Cu­15Cr及Cu­15Cr­0.05Ce合金的微观组织、力学性能、导电性能和摩擦磨损性能。结果表明：微量Ce的加入使Cu­15Cr合金铸态组织枝晶臂直径减小，在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，导电率略有上升，摩擦磨损性能大幅提高。%Cu­15Cr and Cu­15Cr­0.05Ce in­situ composites were prepared by the cast, thermo­mechanical treatment process. The microstructure, mechanical properties, conductivity and friction and wear performance of the in­situ composites were investigated by optical microscope, scanning electronic microscope, tensile­testing machine and pin­on­bar reciprocating device. The results indicate that the trace addition of Ce can refine the primary dendrites of Cu­15Cr alloy and deformed Cr fiber, which leads to a significant increase in strength and slight improvement in conductivity. At the same time, the Cu­15Cr­0.05Ce in­situ composite shows better friction and wear performance.