拉拔和轧制变形铝导线的结构演化及力学与导电性能

doi:10.11901/1005.3093.2017.181

材料研究学报

2018, Vol. 32

Issue (5): 357-364 DOI: 10.11901/1005.3093.2017.181

研究论文

本期目录 | 过刊浏览

拉拔和轧制变形铝导线的结构演化及力学与导电性能

罗雪梅¹, 余虹云², 李瑞², 宋竹满¹, 王强¹, 张哲峰¹, 张广平¹(

)

1 中国科学院金属研究所沈阳 110016
2 国家电网公司电力器材安全性能检测技术实验室浙江华电器材检测研究所杭州 310015

Microstructural Evolution and Mechanical- and Electrical-Property of Cold-Drawn and -Rolled Electrical Aluminum Wires

Xuemei LUO¹, Hongyun YU², Rui LI², Zuman SONG¹, Qiang WANG¹, Zhefeng ZHANG¹, Guangping ZHANG¹(

)

1 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 SGCC-Testing Technology Lab of Electrical Equipment Safety Performance, Zhejiang Huadian Equipment Testing Institute, Hangzhou 310015, China

引用本文:

罗雪梅, 余虹云, 李瑞, 宋竹满, 王强, 张哲峰, 张广平. 拉拔和轧制变形铝导线的结构演化及力学与导电性能[J]. 材料研究学报, 2018, 32(5): 357-364.
Xuemei LUO, Hongyun YU, Rui LI, Zuman SONG, Qiang WANG, Zhefeng ZHANG, Guangping ZHANG. Microstructural Evolution and Mechanical- and Electrical-Property of Cold-Drawn and -Rolled Electrical Aluminum Wires[J]. Chinese Journal of Materials Research, 2018, 32(5): 357-364.

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摘要:

对工业用A4纯铝进行拉拔和轧制两种塑性变形,研究了纯铝导线材料的微观结构演化、强度和导电率。结果表明：在变形量较小时拉拔变形和轧制变形后纯铝铝导线主要由拉长晶粒组成,这些拉长晶粒由位错亚结构组成的小角晶界组成;在相近的等效应变变形情况下,轧制样品中高角晶界的比例更高。拉拔变形后样品的强度和塑性均优于轧制变形后的样品。拉拔变形使材料具有更高强度和导电率。探讨了材料的导电性与形变强化间的关系。

关键词 ：金属材料, 铝, 拉拔, 轧制, 力学性能, 导电率

Abstract：

Commercial A4 pure aluminum electrical wire was subjected to cold drawing and cold rolling respectively, and then their microstructure, strength and electrical conductivity were investigated systematically. Results show that in the case of less deformation, the microstructure both of the cold drawn and rolled aluminum electrical wires consists of elongated grains with low-angle grain boundaries and dislocation substructures; In case of similar equivalent strain deformation, there exists higher percentage of high-angle grain boundaries in the cold-rolled wires. While the strength and ductility of the cold drawn wires are higher than that of the cold rolled ones. Finally, the relationship between deformation strengthening and conductivity of the pure aluminum was elucidated.

Key words： metallic materials aluminum wire drawing rolling mechanical properties electronic conductivity

收稿日期: 2017-03-10

基金资助:资助项目国家电网公司科技科学技术项目(52110416001z),国家自然科学基金(51601198)

作者简介:

作者简介罗雪梅,女,1986年生,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2017.181 或 https://www.cjmr.org/CN/Y2018/V32/I5/357

表1 A4工业纯铝杆化学成分(质量分数,%)

表2 工业用纯铝导线拉拔道次与厚度、变形量、等效应变之间的关系

图1 轧制铝试样的单轴拉伸试样尺寸图

图2 拉拔和轧制变形后铝试样的EBSD取向成像图

图3 拉拔和轧制变形后铝试样的晶界取向差分布图

图4 不同变形量轧制和拉拔铝试样的高角晶界体积分数

图5 不同拉拔和轧制变形量铝试样的平均Schmid因子

图6 不同拉拔和轧制变形量铝试样的屈服强度和均匀伸长率随等效应变量的变化规律

图7 不同变形量铝试样的导电率随等效应变量的变化规律

图8 拉拔变形铝试样实验测得总电阻率(实心方形)和根据方程(9)计算的晶界电阻率率(空心方形)随等效应变量的变化规律

图9 拉拔和轧制变形铝试样导线的强度-导电率关系

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