原位復(fù)合材料組織及性能的影響
(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；2. 國家銅冶煉及加工工程技術(shù)研究中心，贛州 341000)
摘 要: 采用大氣熔煉與形變原位復(fù)合的方法制備形變Cu-10Fe-3Ag原位復(fù)合材料。在不同溫度時(shí)效6 h后，用SEM觀察分析材料的顯微組織；用XRD測定晶面間距的變化，分析合金元素Ag在時(shí)效過程中的行為規(guī)律和作用機(jī)制。結(jié)果表明：Ag能夠促進(jìn)γ-Fe在Cu基體中的時(shí)效析出，同時(shí)降低Fe纖維的熱穩(wěn)定性；隨著時(shí)效溫度的升高，形變Cu-10Fe-3Ag復(fù)合材料的硬度和導(dǎo)電率都是先增加后降低，在475 ℃時(shí)效6 h后，導(dǎo)電率達(dá)到58.4%IACS。合金的斷口全是韌性斷裂，隨著時(shí)效溫度的升高，韌窩變小。
關(guān)鍵字: Cu-10Fe-3Ag原位復(fù)合材料；Fe纖維；硬度；導(dǎo)電率
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
