突破强度-导电率制约关系：晶粒异构设计

doi:10.11900/0412.1961.2022.00222

金属学报

2022, Vol. 58

Issue (11): 1467-1477 DOI: 10.11900/0412.1961.2022.00222

研究论文

本期目录 | 过刊浏览

突破强度-导电率制约关系：晶粒异构设计

侯嘉鹏, 孙朋飞, 王强, 张振军, 张哲峰(

)

中国科学院金属研究所师昌绪先进材料创新中心沈阳 110016

Breaking the Trade-Off Relation Between Strength and Electrical Conductivity: Heterogeneous Grain Design

HOU Jiapeng, SUN Pengfei, WANG Qiang, ZHANG Zhenjun, ZHANG Zhefeng(

)

Shi -changxu Innovation Center for Advanced Materials, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

侯嘉鹏, 孙朋飞, 王强, 张振军, 张哲峰. 突破强度-导电率制约关系：晶粒异构设计[J]. 金属学报, 2022, 58(11): 1467-1477.
Jiapeng HOU, Pengfei SUN, Qiang WANG, Zhenjun ZHANG, Zhefeng ZHANG. Breaking the Trade-Off Relation Between Strength and Electrical Conductivity: Heterogeneous Grain Design[J]. Acta Metall Sin, 2022, 58(11): 1467-1477.

全文: PDF(4110 KB) HTML

摘要:

采用冷拉拔工艺制备了具有不同晶粒特征的工业纯Al线和工业纯Cu线,研究了晶粒对强度和导电率的影响机制。性能测试结果表明,拉拔变形后期,工业纯Al线和工业纯Cu线的强度和导电率同步提高,打破了强度和导电率传统的倒置关系。微观组织观察发现：随着拉拔变形量增大,轴向晶粒被拉长,径向晶粒逐渐细化,径向<001>织构向<111>织构转变,形成了晶粒形状异构和晶体取向异构的微观组织结构。理论分析表明：晶粒宽度和织构主要影响强度,晶粒长度主要影响导电率；提出了轴向长晶粒、径向细晶粒和径向硬取向织构是工业纯Al线和工业纯Cu线强度和导电率同步提高的根本原因。

关键词 ：工业纯Al线, 工业纯Cu线, 异构晶粒, 强度, 导电率

Abstract：

The trade-off relationship between the strength and the electrical conductivity has been the bottleneck restricting the development of conductive metallic materials with high strength and high electrical conductivity. In this study, commercially pure Al wires and commercially pure Cu wires with various grain characteristics were prepared by the cold-drawing process to investigate the influencing mechanisms of grain on strength and electrical conductivity. Surprisingly, the synchronous increase in strength and electrical conductivity may be achieved both for the commercially pure Al wires and commercially pure Cu wires in the later stage of cold-drawing deformation, which shatters the traditional constrictive relationship between the strength and the electrical conductivity. Additionally, the microstructure investigation demonstrates that with the increase of drawing deformation, the axial grains were lengthened, the radial grains were increasingly polished, and the radial <001> texture was transformed to <111> texture. Finally, the heterogeneous microstructures, including heterogeneous grain formation and heterogeneous crystal orientation were formed. The theoretical analysis reveals that the grain width and texture mainly influence the strength, and the grain length primarily influences the electrical conductivity. Consequently, the axial long grain, the radial fine grain, and radial hard orientation texture are proved to be the primary mechanisms causing the synchronous improvement of strength and electrical conductivity of commercially pure Al wires and commercially pure Cu wires. This suggests that the heterogeneous grain design may be considered a useful method to create conductive metallic materials with high strength and high electrical conductivity.

Key words： commercially pure Al wire commercially pure Cu wire heterogeneous grain strength electrical conductivity

收稿日期: 2022-05-07

ZTFLH:

TG356.4

基金资助:国家自然科学基金项目(52001313);中国博士后科学基金项目(2019M661151)

作者简介: 侯嘉鹏,男,1991年生,博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2022.00222 或 https://www.ams.org.cn/CN/Y2022/V58/I11/1467

图1 不同拉拔变形量工业纯Al线和工业纯Cu线的强度-导电率关系曲线

图2 不同拉拔变形量工业纯Al线径向和轴向TEM像

图3 不同拉拔变形量工业纯Cu线径向和轴向TEM像

图4 不同拉拔变形量工业纯Al线径向和轴向EBSD像

图5 不同拉拔变形量工业纯Cu线径向和轴向EBSD像

图6 工业纯Al线和工业纯Cu线内晶粒宽度和晶粒长度随拉拔变形量变化规律

图7 工业纯Al线和工业纯Cu线织构体积分数与变形量的关系

图8 高强高导金属线材晶粒异构设计原理示意图

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