初始微观组织对热处理纯铜线导电性能的影响

doi:10.13251/j.issn.0254-6051.2025.10.004

金属热处理 ›› 2025, Vol. 50 ›› Issue (10): 25-29.DOI: 10.13251/j.issn.0254-6051.2025.10.004

初始微观组织对热处理纯铜线导电性能的影响

龚成功^1,2, 岳武^1,2, 朱俊璇^1,2

1.兰州工业学院材料工程学院, 甘肃兰州 730050;
2.甘肃省无损检测新技术工程研究中心, 甘肃兰州 730050

收稿日期:2025-07-29 修回日期:2025-09-04 出版日期:2025-10-25 发布日期:2025-11-04
通讯作者: 岳武,教授,博士,E-mail:pony.yue@163.com
作者简介:龚成功(1988—),男,讲师,学士,主要研究方向为金属材料加工和热处理,E-mail:gongcglzit@163.com。
基金资助:
国家自然科学基金(51565024);甘肃省重点研发项目(22YF7GA133);兰州市科技计划(2025-2-48)

Effect of initial microstructure on electrical conductivity of pure copper wire after heat treatment

Gong Chenggong^1,2, Yue Wu^1,2, Zhu Junxuan^1,2

1. School of Materials Engineering, Lanzhou Institute of Technology, Lanzhou Gansu 730050, China;
2. Nondestructive Testing New Technology Engineering Research Center of Gansu Province, Lanzhou Gansu 730050, China

Received:2025-07-29 Revised:2025-09-04 Online:2025-10-25 Published:2025-11-04

摘要/Abstract

摘要： 选取两种初始晶粒尺寸相差较大(细小晶粒1 μm和较大晶粒4 μm)的工业纯铜线为研究对象,对其进行750 ℃保温10 min空冷的热处理,通过分析热处理前后两种纯铜线的组织和导电性能变化,研究了初始组织对纯铜线热处理后导电性能的影响。结果表明,热处理前,初始晶粒细小(1 μm)的纯铜线导电率(96.9%IACS)低于初始晶粒较大(4 μm)的纯铜线(102.7%IACS)。热处理后,初始晶粒细小的纯铜线晶粒尺寸长大到约100 μm,远大于初始晶粒较大的纯铜线(40 μm),且其组织中有孪晶出现。两种纯铜线热处理后的导电率都有所提高,且初始晶粒细小的纯铜线导电率(103.9%IACS)仍低于初始晶粒较大的纯铜线(105.7%IACS)。热处理前纯铜线的大角度晶界是决定自身导电性能的关键因素,但热处理后大角度晶界对纯铜线导电率的削弱作用并不明显。

关键词: 纯铜线, 热处理, 微观组织, 导电性

Abstract: Two types of industrial pure copper wires with different initial grain sizes (1 μm and 4 μm, respectively) were heat treated at 750 ℃ for 10 min, and then air cooled. The effect of initial microstructure on their electrical conductivity was studied by analyzing the changes in microstructure and electrical conductivity of the two types of pure copper wires before and after heat treatment. The results show that before heat treatment, the electrical conductivity of the industrial pure copper wire with initial fine grains (1 μm) is 96.9%IACS and lower than that of the industrial pure copper wire with initial larger grains (102.7%IACS). After heat treatment, the grain size of the pure copper wire with the initial fine grains grows to approximately 100 μm, which is much larger than that of the pure copper wire with the initial larger grains (40 μm), and the twin crystals appear in the matrix. After heat treatment, the electrical conductivities of both types of pure copper wires increase, and the electrical conductivity of the pure copper wire with the initial fine grains(103.9%IACS) is still lower than that of the pure copper wire with the initial larger grains(105.7%IACS). Before heat treatment, the high-angle grain boundaries of pure copper wires are the key factor determining their own electrical conductivity. However, after heat treatment, the weakening effect of the high-angle grain boundaries on the electrical conductivity of pure copper wires is not significant.

Key words: pure copper wire, heat treatment, microstructure, electrical conductivity

中图分类号:

TG166.2

龚成功, 岳武, 朱俊璇. 初始微观组织对热处理纯铜线导电性能的影响[J]. 金属热处理, 2025, 50(10): 25-29.

Gong Chenggong, Yue Wu, Zhu Junxuan. Effect of initial microstructure on electrical conductivity of pure copper wire after heat treatment[J]. Heat Treatment of Metals, 2025, 50(10): 25-29.

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初始微观组织对热处理纯铜线导电性能的影响

Effect of initial microstructure on electrical conductivity of pure copper wire after heat treatment

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