原位复合材料组织及性能的影响
(1. 中南大学 材料科学与工程学院，长沙 410083；2. 国家铜冶炼及加工工程技术研究中心，赣州 341000)
摘 要: 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。
关键字: Cu-10Fe-3Ag原位复合材料；Fe纤维；硬度；导电率
mechanical properties of deformation-processed
Cu-10Fe-3Ag in-situ composite
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. National Center for Copper Smelting and Process Engineering Technology Research, Ganzhou 341000, China）
Abstract: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.
Key words: Cu-10Fe-3Ag in-situ composite; Fe fiber; hardness; conductivity
