低氧铜扁线全流程拉拔制备过程组织演变及性能  

Microstructure evolution and properties of low oxygen copper flat wire during whole process of drawing preparation

作　　者：路林 何伟东 杨宝成 王松伟 赵薪茗 宋鸿武[2] LU Lin;HE Weidong;YANG Baocheng;WANG Songwei;ZHAO Xinming;SONG Hongwu(School of Mechanical Engineering,Shenyang University,Shenyang 110003,China;Shichangxu Innovation Center for Advanced Material,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China)

机构地区：[1]沈阳大学机械工程学院,沈阳110003 [2]中国科学院金属研究所师昌绪先进材料创新中心,沈阳110016

出　　处：《中国有色金属学报》2025年第4期1220-1235,共16页The Chinese Journal of Nonferrous Metals

基　　金：重庆市自然科学基金创新发展联合基金重点项目(CSTB2023NSCQ-LZX0116);中国博士后科学基金资助项目(2024M753300)。

摘　　要：为了探究低氧铜扁线拉拔制备过程中微观组织和力学性能变化规律,采用OM和EBSD等方法对不同拉拔变形量的低氧铜圆线及扁线微观组织进行了表征与分析,并对不同道次线材显微硬度和力学性能进行了测试。结果表明:经过拉拔变形后,晶粒伸长呈现纤维状;随着拉拔道次的增多,显微硬度和抗拉强度逐渐提高;经热处理后,发生完全再结晶,形成等轴晶,消除纤维状组织,降低位错和孪晶密度。低氧铜圆线经过三道次拉拔后整体加工率达到64%,线材芯部和边部晶粒长度沿长度方向分别从21.2μm和24.8μm逐渐增加到32.25μm和40.04μm;且经过拉拔变形后,铜圆线芯部织构发生转变,由原始态{001}〈100〉织构和{110}〈111〉织构逐渐发生转动至{112}〈111〉和{110}〈111〉织构;随后经过中间退火后,线材芯部和边部的晶粒恢复等轴状,其尺寸分别为18.39μm和22.29μm,并形成了{110}〈001〉织构,线材芯部和边部的织构强度分别为5.52和4.89。在铜圆线继续拉拔至3 mm×2 mm扁线的过程中,晶粒再次逐渐沿拉拔方向被拉长,此时扁线芯部由初始{001}〈100〉织构依次转变为{112}〈111〉+{110}〈111〉织构、{112}〈111〉织构,最终稳定在{110}〈001〉织构,且极密度为10.3;而扁线边部由初始{001}〈100〉织构转变为{112}〈111〉织构,且极密度为8.44。In order to explore the change law of microstructure and mechanical properties during the drawing process of low oxygen copper flat wire,the microstructure of low oxygen copper round wire and flat wire with different drawing deformation was characterized by OM and EBSD,and the microhardness and mechanical properties of different passes were tested.The results show that after drawing deformation,the grain elongation is fibrous,and the microhardness and tensile strength gradually increase with the increase of the number of drawing passes.After heat treatment,complete recrystallization occurs,forming equiaxed grains with random grain orientations.The fibrous structure disappears,plasticity is restored,and dislocations and twin boundaries within the matrix are reduced,resulting in improved toughness and ductility.After three passes of drawing,the overall diameter overall processing rate of low-oxygen round copper wire reaches 64%,and the grain lengths of the core and edge of the wire gradually increase from 21.2μm and 24.8μm to 32.25μm and 40.04μm along the drawing direction,respectively.After drawing and deformation,the texture of the core of the copper round wire transforms,from the original{001}〈100〉texture and the{110}〈111〉texture to the{112}〈111〉and{110}〈111〉texture.Subsequently,the annealed core and edge grains are restored to equiaxed shape,and their sizes are 18.39μm and 22.29μm,respectively,and a{110}〈001〉texture forms,and the texture strengths of the core and edge are 5.52 and 4.89,respectively.In the process of the round copper wire being drawn to 3 mm×2 mm flat wire,the grain is gradually elongated along the drawing direction again,and the core of the flat wire changes from the initial{001}〈100〉texture to{112}〈111〉+{110}〈111〉texture and{112}〈111〉texture in turn,and finally stabilizes at{110}〈001〉texture with a polar density of 10.3;while the edge of the flat wire changes from the initial{001}〈100〉texture to{112}〈111〉texture,with the polar density of 8

关 键 词：铜扁线 拉拔 织构 力学性能 

分 类 号：TG356[金属学及工艺—金属压力加工]