金包铜复合微丝拉拔过程中组织与性能的演变

发布时间：2018-03-07 11:24

本文选题：金包铜复合微丝　切入点：拉拔　出处：《中国有色金属学报》2017年09期 　论文类型：期刊论文

【摘要】：采用旋锻-拉拔-扩散退火-拉拔方法制备直径60μm金包铜复合微丝,研究拉拔过程中复合微丝显微组织、力学性能和导电率的变化规律。结果表明:所制备的微丝表面光洁和金/铜界面结合状态良好,金层平均厚度约为2.0μm,横断面金包覆层面积比约为10.5%。在拉拔过程中,当真应变增大至2.5时,复合微丝铜芯由退火态的等轴晶组织逐渐转变为条状纤维组织,晶内小角度晶界数量明显增大,微丝的抗拉强度由退火态的235 MPa增大至最大值451 MPa,而断后伸长率由退火态的49.5%降低至1.2%,导电率由100.0%(IACS)下降为98.3%(IACS);继续增大真应变至3.5和4.8时,加工过程中产生的变形热使铜芯发生动态回复和动态再结晶,小角度晶界数量降低,大角度晶界数量增多;当真应变为4.8时,微丝的抗拉强度为439MPa,伸长率上升至3.0%,导电率下降到94.5%(IACS)。
[Abstract]:The microstructures of 60 渭 m gold coated copper composite microwires were prepared by the method of rotary forging, drawing, diffusion annealing and drawing, and the microstructure of the composite microwires during drawing was studied. The change of mechanical properties and conductivity. The results show that the surface of the prepared microfilament is smooth and the interface of gold / copper is good, the average thickness of gold layer is about 2.0 渭 m, and the area ratio of cross-section gold coating layer is about 10.5.The results show that during drawing process, the average thickness of gold layer is about 2.0 渭 m, and the area ratio of cross section gold coating layer is about 10.5. When the true strain is increased to 2.5, the microstructure of the composite microwire copper core changes gradually from the annealed equiaxed structure to the stripe structure, and the number of grain boundaries at small angles increases obviously. The tensile strength of the microwires increased from 235 MPa in the annealed state to the maximum value of 451MPa, while the elongation at break decreased from 49.5% in the annealed state to 1.2, and the conductivity decreased from 100.0and IACSC to 98.3IACSC, and when the true strain was increased to 3.5,4.8. The deformation heat produced in the process of processing causes dynamic recovery and dynamic recrystallization of the copper core. The number of small angle grain boundaries decreases and the number of large angle grain boundaries increases, when the true strain is 4.8, The tensile strength of the microfilament was 439 MPA, the elongation increased to 3.0 and the electrical conductivity decreased to 94.5a.
【作者单位】：北京科技大学材料先进制备技术教育部重点实验室;北京科技大学现代交通金属材料与加工技术北京实验室;
【基金】：国家自然科学基金资助项目(51104016) 稀贵金属综合利用新技术国家重点实验室开放课题资助项目(SKL-SPM-201204)~~
【分类号】：TG359

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