冷拔工艺对工业单晶铜线材组织和力学性能的影响  

Effect of Cold-drawing Process on Microstructure and Mechanical Properties of Industrial Single Crystal Copper Wire

作　　者：李炳[1] 范新会[1] 王鑫[1] 陈建[1] 严文[1] 

机构地区：[1]西安工业大学材料与化工学院,西安710021

出　　处：《西安工业大学学报》2013年第6期480-484,共5页Journal of Xi’an Technological University

基　　金：陕西省自然科学基础研究计划项目资助(2010JM6015)

摘　　要：单晶铜线材常需经过冷拔变形才能使用,冷拔变形导致单晶铜线材的微观组织发生改变,影响其性能.文中在不同的冷拔工艺下,对热型连铸工业单晶铜线材进行了冷拔变形实验,分析了冷拔工艺对其组织和力学性能的影响.结果表明:当总体真应变一定时,较小的相邻模具真应变量和较低冷拔速度仅能使工业单晶铜线材内部晶粒拉长、变细.增加相邻模具真应变和冷拔速度均会导致线材内部局部区域出现形变位错界面和形变孪晶.随着冷拔速度和相邻模具真应变的增加,冷拔工业单晶铜线材的强度增加、延伸率下降.采用较低的冷拔速度,较小的相邻模具间真应变,工业单晶铜线材优异的塑性得以较好的延续,穿模成功率提升,冷拔过程中的断线率降低.The single crystal copper wire must be cold-drown ordinarily before it can be used. The microstructure of single crystal copper wire will change in cold drawing which affects its performance. Industrial single crystal copper wire（ISCCW） has been cold-drown under different process conditions, the microstructures and mechanical properties of ISCCW after cold-drew were investigated. The results show that the lower drawing speed and smaller true strain between drawing dies only could make grain become longer and thinner when overall real strain is constant. The deformation dislocation interface and deformation twins occur in partial regions under the higher drawing speed and true strain between drawing dies. With the increase of drawing speed and true strain between drawing dies, the strength of ISCCW increases, but the elongation decreases. So that, the lower drawing speed and smaller true strain between drawing dies will make plasticity of ISCCW increased, the success rate of drawing-in dies improved,and wire breakage rate in cold drawing process decreased.

关 键 词：工业单晶 冷拔速度 真应变 微观组织 力学性能 

分 类 号：TG113.25[金属学及工艺—物理冶金]