时效处理对形变Cu-10Fe-3Ag原位复合材料组织及性能的影响

Effect of aging treatment on microstructure and mechanical properties of deformation-processed Cu-10Fe-3Ag in-situ composite

采用大气熔炼与形变原位复合的方法制备形变Cu-10Fe-3Ag原位复合材料。在不同温度时效6 h后,用SEM观察分析材料的显微组织;用XRD测定晶面间距的变化,分析合金元素Ag在时效过程中的行为规律和作用机制。结果表明:Ag能够促进γ-Fe在Cu基体中的时效析出,同时降低Fe纤维的热稳定性;随着时效温度的升高,形变Cu-10Fe-3Ag复合材料的硬度和导电率都是先增加后降低,在475℃时效6 h后,导电率达到58.4%IACS。合金的断口全是韧性断裂,随着时效温度的升高,韧窝变小。

The deformation-processed Cu-10Fe-3Ag in-situ composite was prepared using fusion cast in air.After aging 6 h at different temperatures,the microstructure of Cu-10Fe-3Ag in-situ composite was studied by SEM,the lattice space of Cu-10Fe-3Ag in-situ composite was tested by XRD,and the mechanism of Ag element was analyzed during ageing treatment.The results show that the presence of Ag can not only accelerate γ-Fe precipitation from the Cu matrix,but also reduce the thermal stability of Fe fibers.The hardness and conductivity of Cu-10Fe-3Ag in-situ composite increase at first and then decrease with the ageing temperature increasing.The conductivity of Cu-10Fe-3Ag in-situ composite can reach 58.4% IACS when ageing at 475 ℃for 6 h.The fractures of the alloy are all ductile rupture and the dimples become smaller with the ageing temperature increasing.