摘要
采用粉末套管工艺,结合集束拉拔技术制备出了石墨烯包覆铌粉末增强Cu-Nb的多芯复合线材(3#)、石墨烯未包覆铌粉末增强Cu-Nb多芯复合线材(4#)、及纯铌粉增强Cu-Nb多芯复合线材(5#) 3种结构复合线材。通过优化热处理工艺发现,线材在750℃/60h热处理后,与线材的Nb (110)衍射峰强度相比加工态样品发生了明显的增强。微观结构及EDS能谱分析说明,高温热处理有利于Cu/Nb界面之间的轻微扩散,增加了界面的结合强度,线材的塑性和韧性得到了明显改善。通过对3种线材微观结构、力学性能及电学性能的分析表明,石墨烯包覆铌粉末的Cu-Nb-C-Nb线材导电性能优于其它2种线材。最后,分析了3种不同线材的塑性变形机制及引起性能变化的微观机理。提出了进一步优化工艺,为高强高导多元结构复合线材的制备开创了一种全新的方向。
Three kinds of multi-core composite wires were prepared by powder casting technology combined with bundling and drawing process, including graphene-coated niobium powder reinforced Cu-Nb(3#), grapheme and niobium powder reinforced Cu-Nb(4#), and pure niobium powder reinforced Cu-Nb(5#). It is found that the intensity of Nb(110) diffraction peak is obviously enhanced after750 ℃/60 h heat treatment. The analyses on the microstructure and energy spectrum(EDS) show that the high temperature heat treatment is favorable for the slight diffusion between the Cu/Nb interface, increasing the bonding strength of interface;plasticity and toughness are also improved greatly. The results show that the conductivity of Cu-Nb-C-Nb wire with graphene-coated niobium powder is better than that of the other two kinds of wires. Finally, plastic deformation mechanism and micro-mechanism of performance change of the three different materials were analyzed. An idea of further optimization of the process is put forward, which opens up a new direction for the preparation of high strength and high conductivity multi-element composite wires.
作者
王鹏飞
张平祥
梁明
金利华
徐晓燕
李成山
李金山
Wang Pengfei;Zhang Pingxiang;Liang Ming;Jin Lihua;Xu Xiaoyan;Li Chengshan;Li Jinshan(Northwestern Polytechnical University,Xi'an 710072,China;Northwest Institute for Nonferrous Metal Research,Xi'an 710016,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2019年第3期936-940,共5页
Rare Metal Materials and Engineering
基金
国家自然科学基金项目(51601151)
国家重大专项支持项目(2016YFA0401701)
陕西省自然基金项目(2017ZDJC-19)
