退火态铝合金导体的压缩蠕变

doi:10.13251/j.issn.0254-6051.2025.06.009

金属热处理 ›› 2025, Vol. 50 ›› Issue (6): 54-58.DOI: 10.13251/j.issn.0254-6051.2025.06.009

退火态铝合金导体的压缩蠕变

陈瑞^1,2, 陈保安^1,2, 李梦琳^1,2, 韩钰^1,2, 祝志祥^1,2, 杨长龙³, 郑维刚³, 夏霏霏⁴

1.国网智能电网研究院有限公司先进输电技术全国重点实验室,北京 102209;
2.国网智能电网研究院有限公司电工新材料研究所, 北京 102209;
3.国网辽宁省电力有限公司电力科学研究院, 辽宁沈阳 110006;
4.远东电缆有限公司, 江苏无锡 214257

收稿日期:2024-12-09 修回日期:2025-03-27 出版日期:2025-06-25 发布日期:2025-07-08
作者简介:陈瑞(1993—),男,工程师,博士,主要研究方向为金属材料加工,E-mail:chenruitywz@163.com
基金资助:
国家电网公司总部科技项目(5500-202228109A-1-1-ZN)

Compressive creep of annealed aluminum alloy conductor

Chen Rui^1,2, Chen Baoan^1,2, Li Menglin^1,2, Han Yu^1,2, Zhu Zhixiang^1,2, Yang Changlong³, Zheng Weigang³, Xia Feifei⁴

1. State Key Laboratory of Advanced Power Transmission Technology, State Grid Smart Grid Research Institute Co., Ltd., Beijing 102209, China;
2. Department of Electrical Engineering New Materials, State Grid Smart Grid Research Institute Co., Ltd., Beijing 102209, China;
3. Electric Power Research Institute of State Grid Liaoning Electric Power Co., Ltd., Shenyang Liaoning 110006, China;
4. Far East Cable Co., Ltd., Wuxi Jiangsu 214257, China

Received:2024-12-09 Revised:2025-03-27 Online:2025-06-25 Published:2025-07-08

摘要/Abstract

摘要： 采用配置环境箱的DDL20电子万能材料试验机及光学显微镜和扫描电镜研究了退火态铝合金导体的显微组织和压缩蠕变行为。结果表明,铝合金再结晶退火后的组织为微米级索状相和纳米颗粒相,分布在扁长的再结晶晶粒内。在90~120 ℃、35~48 MPa蠕变条件下,退火态铝合金导体压缩蠕变存在阈值应力且稳态蠕变速率对应力敏感。低温蠕变条件下,退火态铝合金受应力的影响更大。压缩蠕变的真应力指数为4.9,本构方程为ν=1.292×10^-4(σ-8.0)4.92exp(-68 300/RT)。压缩蠕变机制为受富铁相阻碍的位错滑移机制。由此可见,提高铝合金导体中第二相对位错的阻碍作用,可提高铝合金导体材料在服役条件下的压缩蠕变抗力。

关键词: 铝合金, 微观组织, 压缩蠕变, 力学性能

Abstract: Microstructure and compressive creep behavior of an annealed aluminum alloy conductor were studied by DDL20 electronic universal material testing machine equipped with environmental chamber, optical microscope and scanning electron microscope. The experimental results show that the microstructure of the tested aluminum alloy after recrystallization annealing contains micron-sized cord-like phase and nanoparticle phase, both of which are distributed within prolate recrystallized grains. Under the creep conditions of 90-120 ℃ and 35-48 MPa, the compressive creep of the annealed aluminum alloy conductor has threshold stress, and its steady-state creep rate is sensitive to stress. Under low temperature creep conditions, the annealed aluminum alloy is more affected by the stress. The true stress exponent of compression creep is 4.9, and the constitutive equation is ν=1.292×10^-4(σ-8.0)4.92exp(-68 300/RT). The compression creep mechanism is a dislocation slip mechanism hindered by the iron-rich phase. It can be seen that increasing the hindrance of the second phase to the dislocations in the aluminum alloy conductor can enhance the compressive creep resistance of the aluminum alloy conductor under service conditions.

Key words: aluminum alloy, microstructure, compressive creep, mechanical properties

中图分类号:

TG166.3

陈瑞, 陈保安, 李梦琳, 韩钰, 祝志祥, 杨长龙, 郑维刚, 夏霏霏. 退火态铝合金导体的压缩蠕变[J]. 金属热处理, 2025, 50(6): 54-58.

Chen Rui, Chen Baoan, Li Menglin, Han Yu, Zhu Zhixiang, Yang Changlong, Zheng Weigang, Xia Feifei. Compressive creep of annealed aluminum alloy conductor[J]. Heat Treatment of Metals, 2025, 50(6): 54-58.

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退火态铝合金导体的压缩蠕变

Compressive creep of annealed aluminum alloy conductor

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