单晶连铸小直径铜线材的静拉伸力学性能研究  

Mechanical properties of copper wires with small diameter by continuous casting of single crystal

作　　者：李炳[1] 王鑫[1] 郭俊仓[1] 范新会[1] 严文[1] 

机构地区：[1]西安工业学院材料与化工学院,西安710032

出　　处：《西安工业学院学报》2005年第6期579-583,共5页Journal of Xi'an Institute of Technology

基　　金：国家自然科学基金(59971033);兵科院预研基金资助项目(420010800304)

摘　　要：采用单晶连铸技术生产的单晶铜线材不仅具有优美的外观和内部质量,也具有非常优异的塑性加工性能.单晶铜线材在实际应用时,一般需要进行数次冷拔变形,因此,研究其力学性能,对单晶线材获得广泛应用具有实际意义.采用自制的单晶连铸设备,制备出直径为2.6mm的单晶铜线材和多晶铜线材.对两种线材的力学性能进行测试分析,并与普通铜线材进行对比.结果表明:采用单晶连铸技术生产的铜线材的抗拉强度和屈服强度均比普通铜线材低的多,而延伸率却有大幅度提升.同种技术生产的单晶和多晶两种线材相比,单晶铜线材的塑性更为优异.对拉伸断口进行扫描发现:单晶连铸多晶铜线材和普通铜线材的断裂为典型的微孔聚集型断裂,而单晶铜线材的断裂属于滑移延伸断裂.The single crystal copper wire（SCCW）,which was produced by continuous casting of single crystal（CCSC） ,has not only excellent surface and inner quality,but superb plastic deformation property as well. Because the SCCW must be cold-drawn in the process to produce cable, so it is very significative to study the mechanical properties of the wire. Using self-designed and manufactured CCSC equipment, the single crystal and polycrystal copper wires with diameter of 2.6mm have been produced. The mechanical properties of these two types of wires have been tested and compared with the ordinary copper wire. The results show that the tensile strength σb and the yield strength σ0.2 of these copper wires are both lower but the elongation are higher than ordinary copper wires. Compared with the plastic deformation property of the polycrystal copper wire, the SCCW is better; The morphology of the tensile fracture has been observed by SEM and the results show that the tensile fractures of polycrystal copper wire and ordinary copper wire are typical micovoid coalescence fracture, while the tensile fractures of SCCW is slip-elongation rupture.

关 键 词：单晶连铸技术 单晶铜线材 静态拉伸 力学性能 断口形貌 

分 类 号：TG249.7[金属学及工艺—铸造]