Ag含量对低合金化Cu-Ag合金拉拔线材组织和性能的影响  

Effects of Ag content on microstructure and properties of low-alloyed Cu-Ag drawn wires

作　　者：杨文朋[1,2] 位高锋 封存利 介明山 武国旗 YANG Wenpeng;WEI Gaofeng;FENG Cunli;JIE Mingshan;WU Guoqi(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454000,China;Henan Senger Materials Technology Co.,Ltd.,Jiaozuo 454010,China)

机构地区：[1]河南理工大学材料科学与工程学院,焦作454000 [2]河南森格材料科技有限公司,焦作454010

出　　处：《中国有色金属学报》2024年第8期2697-2707,共11页The Chinese Journal of Nonferrous Metals

基　　金：科技部“科技助力经济”重点专项(SQ2020YFF0420391)。

摘　　要：采用热型水平连铸技术制备Ag含量分别为0.6%、1.0%、2.0%和4.0%的Cu-Ag合金杆坯,并将d 16.0 mm杆坯拉拔加工成d 1.0 mm的线材,利用透射电镜分析其微细组织,并测试导电和力学性能。结果表明:拉拔线材由平行于拉拔方向的纤维晶组成,Cu-0.6Ag合金线纤维晶平均宽度约为340 nm;随着Ag含量增加,纤维晶尺寸减小,Cu-4.0Ag合金线纤维晶平均宽度为115 nm。纤维晶存在显著的〈111〉取向,纤维晶晶界主要为由位错塞积形成的小角度晶界,晶内存在大量位错,并发现少量的孪晶。随着Ag含量增加,Ag元素分布由局部富集转变为Ag相析出。Cu-0.6Ag和Cu-4.0Ag合金线材导电率随Ag含量的增大而减小,分别为91.2%IACS和79.5%IACS。Cu-0.6Ag和Cu-4.0Ag合金线材抗拉强度随Ag含量的增加而增大,分别为402.6 MPa和702.9 MPa。抗拉强度提高的主要原因是细晶强化和Ag相沉淀强化作用。The Cu-Ag alloy rods with Ag contents(mass fraction)of 0.6%,1.0%,2.0%and 4.0%,respectively,were prepared by horizontal Ohno continuous casting technology,and the rods with diameter of 16 mm were drawn into wires with diameter of 1.0 mm.The microstructure of the wires was investigated by transmission electron microscopy,and its electrical conductivity and mechanical properties were tested.The results show that the wire is composed of fiber crystals parallel to the drawing direction.The average width of fiber crystal of Cu-0.6Ag alloy wire is about 340 nm.With the increase of Ag content,the size of fiber crystal decreases,and the average width of fiber crystal of Cu-4.0Ag alloy wire is 115 nm.The fiber crystals have significant〈111〉orientation.The fiber grain boundary is mainly composed of small angle grain boundaries formed by dislocation pile-up.There are a large number of dislocations in the crystal and a small amount of twins are found.With the increase of Ag content,the distribution of Ag element changes from local enrichment to Ag phase precipitation.The electrical conductivities of Cu-0.6Ag and Cu-4.0Ag alloy wires decrease with the increase of Ag content,and are 91.2%IACS and 79.5%IACS,respectively.The tensile strengths of Cu-0.6Ag and Cu-4.0Ag alloy wires increase with the increase of Ag content,are 402.6 MPa and 702.9 MPa,respectively.The improvement of strength is mainly due to fine grain strengthening and precipitation strengthening of Ag phase.

关 键 词：CU-AG合金 热型连铸 拉拔 导电率 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]