Zr含量对Al-Zr合金时效析出和性能的影响

doi:10.13251/j.issn.0254-6051.2021.09.008

金属热处理 ›› 2021, Vol. 46 ›› Issue (9): 47-52.DOI: 10.13251/j.issn.0254-6051.2021.09.008

Zr含量对Al-Zr合金时效析出和性能的影响

陈保安^1,2, 祝志祥^1,2, 王瑞红³, 陈新^1,2, 韩钰^1,2, 李红英⁴, 肖翔⁵

1.全球能源互联网研究院有限公司先进输电技术国家重点实验室, 北京 102209;
2.全球能源互联网研究院有限公司电工新材料研究所, 北京 102209;
3.西安理工大学材料科学与工程学院, 陕西西安 710048;
4.中南大学材料科学与工程学院, 湖南长沙 410083;
5.中铝材料应用研究院有限公司轻合金材料所, 北京 102209

收稿日期:2021-05-25 出版日期:2021-09-25 发布日期:2021-12-09
作者简介:陈保安(1981—),男,高级工程师,博士,主要研究方向为电工导体材料,E-mail:dzcba@163.com
基金资助:
北京市科技计划(Z181100005218002)

Effect of Zr content on aging precipitation and properties of Al-Zr alloy

Chen Baoan^1,2, Zhu Zhixiang^1,2, Wang Ruihong³, Chen Xin^1,2, Han Yu^1,2, Li Hongying⁴, Xiao Xiang⁵

1. State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute Co., Ltd., Beijing 102209, China;
2. Department of Electrical Engineering New Materials, Global Energy Interconnection Research Institute Co., Ltd., Beijing 102209, China;
3. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an Shaanxi 710048, China;
4. School of Materials Science and Engineering, Central South University, Changsha Hunan 410083, China;
5. Light Alloy Material Institute, Chinalco Materials Application Research Institute Co., Ltd., Beijing 102209, China

Received:2021-05-25 Online:2021-09-25 Published:2021-12-09

摘要/Abstract

摘要： 对比研究了Zr添加(0.05,0.15和0.25wt%)对Al-Zr合金固溶态和固溶轧制态时效析出行为、硬度和导电率的影响。结果表明,固溶态Al-Zr合金的晶粒尺寸随Zr含量的增加而减小,但是固溶轧制态Al-Zr合金的晶粒尺寸对Zr添加量不敏感。固溶态Al-Zr合金在350 ℃时效过程中,由于Al₃Zr沉淀相的析出,合金硬度随Zr含量增大而增大,但是更强的点阵畸变场则导致导电率降低。而在固溶轧制态合金的时效中,大量变形位错的存在促进了Al₃Zr相的析出,Al-Zr合金在250 ℃下时效具有比350 ℃时效更优的硬度和导电率的综合性能。特别是0.25wt%Zr添加的Al-Zr合金,其析出强化可以有效补偿时效过程中位错湮灭引起的硬度降低,保持较高的硬度。综合考虑,固溶轧制态Al-0.25wt%Zr合金经250 ℃时效25 h后具有最优的硬度(47.5 HV0.5)和导电率(55.6%IACS)组合。

关键词: Al-Zr合金, Zr含量, 时效析出, 力学性能, 电学性能

Abstract: Effects of Zr addition (0.05, 0.15 and 0.25wt%) on precipitation, hardness, electrical conductivity of solution-treated and solution-rolled Al-Zr alloys were compared and studied. The results show that the grain size of solution-treated Al-Zr alloys deceases with the increase of Zr content, but the grain size of solution-rolled alloys is insensitive to the Zr addition. Due to the precipitation of Al₃Zr particles in the aging process at 350 ℃, the hardness of solution-treated Al-Zr alloys increases with the increase of Zr content. However, stronger lattice distortion field leads to the decrease of electrical conductivity. During the aging of solution-rolled Al-Zr alloys, a large number of deformation dislocations promote precipitation of the Al₃Zr phase, which makes the Al-Zr alloys aged at 250 ℃ to have better combined properties of hardness and conductivity than that aged at 300 ℃. Especially, with the addition of 0.25wt%Zr in the Al-Zr alloys, the precipitation strengthening during aging can effectively compensate the hardness lowering caused by dislocation annihilation, so that the high hardness of the alloys is maintained. Overall, the optimal combined properties of hardness and conductivity of 47.5 HV0.05 and 55.6%IACS can be obtained by the solution-rolled Al-0.25wt%Zr alloys aged at 250 ℃ for 25 h.

Key words: Al-Zr alloy, Zr content, aging precipitation, mechanical properties, electrical conductivity

中图分类号:

TG244.2

陈保安, 祝志祥, 王瑞红, 陈新, 韩钰, 李红英, 肖翔. Zr含量对Al-Zr合金时效析出和性能的影响[J]. 金属热处理, 2021, 46(9): 47-52.

Chen Baoan, Zhu Zhixiang, Wang Ruihong, Chen Xin, Han Yu, Li Hongying, Xiao Xiang. Effect of Zr content on aging precipitation and properties of Al-Zr alloy[J]. Heat Treatment of Metals, 2021, 46(9): 47-52.

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Zr含量对Al-Zr合金时效析出和性能的影响

Effect of Zr content on aging precipitation and properties of Al-Zr alloy

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