拉拔变形量对Cu-4 mass%Ag合金线材组织和性能的影响  

Effect of drawing deformation on microstructure and properties of Cu-4 mass%Ag alloy wire

作　　者：谷继华 张学宾[1] 周延军[1] 宋克兴[1,2] 李韶林 曹军[3] 张朝民[1] 张朋飞 李鑫 吴捍疆 GU Ji-hua;ZHANG Xue-bin;ZHOU Yan-jun;SONG Ke-xing;LI Shao-lin;CAO Jun;ZHANG Chao-min;ZHANG Peng-fei;LI Xin;WU Han-jiang(School of Materials Science and Engineering,Henan University of Science and Technology,Luoyang 471023,China;Henan Academy of Sciences,Henan Province,Zhengzhou 450002,China;School of Mechanical and Power Engineering,Henan Polytechnic University,Jiaozuo 454000,China)

机构地区：[1]河南科技大学材料科学与工程学院,河南洛阳471023 [2]河南省科学院,河南郑州450002 [3]河南理工大学机械与动力工程学院,河南焦作454000

出　　处：《材料热处理学报》2023年第7期65-73,共9页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(U21A2051);中原学者工作站资助项目(214400510028);河南省重点研发与推广专项(212102210441);中国工程科技发展战略河南研究院战略咨询研究项目(2021HENZDA02)。

摘　　要：采用三室真空冷型竖引连铸设备制备了线径为7.821 mm的铸态Cu-4 mass%Ag合金杆,并利用多道次连续拉拔工艺制备了变形量分别为53.38%、93.14%和98.37%的线材;分别对铸态和拉拔态的Cu-4 mass%Ag合金线材进行力学性能、电学性能测试以及微观组织分析。结果表明:铸态Cu-4 mass%Ag合金杆的抗拉强度为236 MPa、导电率为88.50%IACS,当拉拔变形量达到98.37%时,抗拉强度升高到674 MPa,提升了185.59%,而导电率下降到81.00%IACS,仅下降了8.47%;铸态Cu-4 mass%Ag合金杆的横截面组织为典型的“纺布”状枝晶、纵截面为“鱼骨”状枝晶,随着拉拔变形量的增加,线材在纵截面上整体结构呈现出纤维状组织,边缘部分的变形程度要比心部剧烈;当拉拔变形量达到98.37%时,产生了形变孪晶。加工硬化和细晶强化是Cu-4 mass%Ag合金线材拉拔过程中的主要强化机制。As-cast Cu-4 mass%Ag alloy rod with a wire diameter of 7.821 mm was prepared by using a three-chamber vacuum-cooled vertical continuous casting equipment,and the wire rods with deformation of 53.38%,93.14%and 98.37%were prepared by multi-pass continuous drawing process.Mechanical properties,electrical properties and microstructure of the as-cast and as-drawn Cu-4 mass%Ag alloy wires were tested respectively.The results show that the tensile strength of the as-cast Cu-4 mass%Ag alloy rod is 236 MPa,and the electrical conductivity is 88.50%IACS.When the drawing deformation reaches 98.37%,the tensile strength increases to 674 MPa,which increases by 185.59%,while the electrical conductivity decreases to 81.00%IACS,which decreases by 8.47%.The cross section microstructure of the as-cast Cu-4 mass%Ag alloy rod is typical“spinning cloth”dendrite,and the longitudinal section microstructure is“fishbone”dendrite.With the increase of drawing deformation,the overall microstructure of the wire rod in the longitudinal section presents fibrous structure,and the deformation degree of the edge part is more severe than that of the core part.When the drawing deformation reaches 98.37%,deformation twins are formed.Work hardening and fine grain strengthening are the main strengthening mechanisms in the drawing process of the Cu-4 mass%Ag alloy wire rod.

关 键 词：Cu-4 mass%Ag合金 连续拉拔 力学性能 电学性能 微观组织 

分 类 号：TG146.1[一般工业技术—材料科学与工程]