微量Fe、Si对铝导电杆组织与性能的影响
Effect of micro Fe and Si on microstructure and properties of aluminum conductive rod
金胜 1李红英 1孔耀颉 1姜雁斌 1饶茂 2杨奇锋 3王选理3
作者信息
- 1. 中南大学 材料科学与工程学院,长沙 410083
- 2. 西南铝业(集团)有限责任公司,重庆 401326
- 3. 湖南华菱线缆股份有限公司,湘潭 411104
- 折叠
摘要
采用电子背散射衍射(EBSD)、扫描电镜(SEM)、透射电镜(TEM)、扫描探针显微镜(SPM)、室温拉伸、单臂电桥和纳米压痕蠕变等方法,研究了微量Fe、Si对铝导电杆组织与性能的影响.结果表明:Fe、Si能够降低导电杆的晶粒尺寸,并使织构组分由弱<001>+<111>双织构向强<111>织构转变,产生沿挤压方向分布的Al-Fe和Al-Fe-Si相,且在第二相和(亚)晶界处出现位错塞积;Fe、Si通过粗颗粒促进再结晶和细颗粒抑制再结晶的共同作用,造成导电杆的显微组织沿径向出现周期性交替分布;Fe、Si能够在牺牲较小导电率的前提下,显著提高铝导电杆的强度和抗蠕变性能.
Abstract
The effects of Fe and Si on the microstructure and properties of aluminum conductive rod were investigated by electron backscatter diffraction(EBSD),scanning electron microscopy(SEM),transmission electron microscopy(TEM),scanning probe microscopy(SPM),room temperature tensile,single arm bridge and nanoindentation creep.The results indicate that Fe and Si can reduce the grain size of the conductive rod,making the texture component change from weak<001>+<111>double texture to sharp<111>texture.The presence of Al-Fe and Al-Fe-Si phases is observed to be distributed along the extrusion direction,and appear obvious dislocation pile-up at the second phase and(sub)grain boundary.Fe and Si promote recrystallization through coarse particles and inhibit recrystallization through fine particles,resulting in periodic alternating distribution of the microstructure of the conductive rod along the radial direction.Fe and Si can significantly improve the strength and creep resistance of aluminum conductive rod at the expense of small conductivity.
关键词
Fe/Si/铝导电杆/动态再结晶/强度/导电率/蠕变Key words
Fe/Si/aluminum conductive rod/dynamic recrystallization/strength/electrical conductivity/creep引用本文复制引用
基金项目
国家自然科学基金资助项目(52274403)
出版年
2024
NETL
NSTL
万方数据