在A6电工铝导线的冷拉拔过程中织构的演变

doi:10.11901/1005.3093.2014.786

材料研究学报

2015, Vol. 29

Issue (7): 555-560 DOI: 10.11901/1005.3093.2014.786

本期目录 | 过刊浏览

在A6电工铝导线的冷拉拔过程中织构的演变

吴细毛¹,和正华²,李春和¹,柳金龙²,张芳²,沙玉辉²(

)

1. 国网辽宁省电力有限公司电力科学研究院沈阳 110006
2. 东北大学材料各向异性与织构教育部重点实验室沈阳 110819

Evolution of Drawing Texture for A6 Aluminum Conductor

Ximao WU¹,Zhenghua HE²,Chunhe LI¹,Jinlong LIU²,Fang ZHANG²,Yuhui SHA^2,^**(

)

1. Electric Power Research Institute of Liaoning Electric Power Co., Ltd., Liaoning Electric Power Co., Ltd., Shenyang 110006, China
2. Key Laboratory for Anisotropy and Texture of Materials (Ministry of Education), Northeastern University, Shenyang 110819, China

引用本文:

吴细毛,和正华,李春和,柳金龙,张芳,沙玉辉. 在A6电工铝导线的冷拉拔过程中织构的演变[J]. 材料研究学报, 2015, 29(7): 555-560.
Ximao WU, Zhenghua HE, Chunhe LI, Jinlong LIU, Fang ZHANG, Yuhui SHA. Evolution of Drawing Texture for A6 Aluminum Conductor[J]. Chinese Journal of Materials Research, 2015, 29(7): 555-560.

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摘要:

用宏微观织构分析方法研究了A6铝导线冷拉拔过程中的织构演变。结果表明, 这种导线在拉拔过程中形成以<111>和<100>丝织构为主的形变织构, 随着变形量的增大<100>织构减少、<111>织构增强。形变织构沿导线的径向呈不均匀分布: 在中等形变量情况下, 从导线表层至中心织构由强<100>织构(体积分数~52%)过渡到强<111>织构(体积分数~55%); 在高应变量情况下, 径向织构梯度减弱, 通体形成强<111>织构(各层的<111>织构体积分数超过70%)。同时, 在拉拔过程中导线心部的硬度比表层的高, 表明织构对导线强度及沿径向分布梯度起重要作用。用调整拉拔工艺可对位错密度和织构及其分布进行优化, 进而提高导线的强度和导电性能。

关键词 ：金属材料, 织构演变, 拉拔, 铝导线, 微结构

Abstract：

Evolution of drawing texture for A6 aluminum conductor with the drawing process was investigated by macro and micro-texture analysis. The results show that the fiber-like deformation texture of <111> and <100> formed in the drawing process, and <100> texture reduced while <111> texture enhanced with the increasing strain. The distribution of deformed texture was of homogeneity along the radial direction of wire: the deform texture transformed from strong <100> texture (~52% volume fraction) in the surface to strong <111> texture (~55%) in the center by moderate strains; the radial gradient texture was weakened and a strong <111> texture (>70%) formed in the overall wire by high strains. Moreover, the core hardness of the wire was higher than that of the surface, which attributed to the texture gradient distribution along the radial. Adjusting the drawing process to optimize the dislocation density and texture as well as their distribution in the wire is an effective route to improve the strength and conductive properties of the A6 aluminum conductor.

Key words： metallic materials texture evolution drawing aluminum conductor microstructure

收稿日期: 2014-12-29

基金资助:* 国家电网公司科技部资助项目DKYKJ[2012]006-2。

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图1 线材宏观织构测量试样的布置示意图

图2 不同变形量A6铝导线的ODF恒φ2截面图

图3 不同变形量A6铝导线中心区域的取向成像图

图4 A6铝导线织构的体积分数随着变形率的变化

图5 61%变形量A6铝导线不同厚度层的取向成像图和反极图

图6 90%变形量A6铝导线不同厚度层的取向成像图和极图

图7 A6铝导线不同区域织构的体积分数和显微硬度随着变形率的变化

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