(東南大學(xué) 材料科學(xué)與工程學(xué)院，南京 211189)
摘 要: 采用原位變形法制備Cu-8%Fe，Cu-12%Fe和Cu-16%Fe(質(zhì)量分?jǐn)?shù))3種復(fù)合材料，利用金相顯微鏡和掃描電鏡觀察各材料的顯微組織，利用拉伸試驗和雙臂電橋分別對力學(xué)性能和導(dǎo)電性能進行研究，并與經(jīng)相同加工過程的純銅材料進行對比。結(jié)果表明：在形變加工過程中，Cu-Fe復(fù)合材料中的Fe相由枝晶狀逐漸變成沿形變方向的纖維狀結(jié)構(gòu)；隨應(yīng)變量逐漸增加，纖維逐漸增長，間距和寬度逐漸減小，分布趨于均勻，排列方向趨于一致；且隨著應(yīng)變量的增加，Cu-Fe復(fù)合材料的硬度和屈服強度呈上升趨勢，塑性和導(dǎo)電性能呈下降趨勢；退火后其屈服強度下降，導(dǎo)電性能增強。
關(guān)鍵字: Cu；Fe；復(fù)合材料；力學(xué)性能；導(dǎo)電性能
conductivity properties of Cu-Fe composites
（School of Materials Science and Engineering, Southeast University, Nanjing 211189, China）
Abstract:Cu-8%Fe, Cu-12%Fe and Cu-16%Fe (mass fraction) composites were prepared by in-situ synthesis technique and heavy deformation processing. Metallography microscope and scanning electron microscope were used to observe the microstructures of the Cu-Fe composites. The mechanical properties and electrical conductivity were studied by tensile test and double bridge, respectively. The three Gu-Fe composites were compared with pure copper treated in the same way. The results show that, during the deformation process, the primary and second dendritic arms of Fe phase are aligned along the drawing direction and elongated into filaments. With increasing drawing strains, the filaments become longer and thinner, and the space between them is shortened, and their orientations are gradually in good order. The improvement of hardness and yield strength results in heavy deformation, whereas the plasticity and electrical conductivity decrease. After annealing, the yield strength of Cu-Fe in-situ composites decreases, and the conductivity property increases.
Key words: Cu; Fe; composites; mechanical properties; conductivity property
