脉冲电流对Al-Cu-Mn-Zr合金时效处理组织及性能的影响

doi:10.13251/j.issn.0254-6051.2023.04.017

金属热处理 ›› 2023, Vol. 48 ›› Issue (4): 104-110.DOI: 10.13251/j.issn.0254-6051.2023.04.017

脉冲电流对Al-Cu-Mn-Zr合金时效处理组织及性能的影响

蔡春波¹, 高少伟², 高桂丽², 石德全³

1.上海海事大学物流工程学院, 上海 200135;
2.上海电子信息职业技术学院机械与能源工程学院, 上海 201411;
3.上海理工大学材料与化学学院, 上海 200093

收稿日期:2022-12-02 修回日期:2023-01-12 发布日期:2023-05-27
通讯作者: 石德全,教授,博士,E-mail:shidequan2008@163.com
作者简介:蔡春波(1974—),女,副教授,博士,主要研究方向为高性能铝镁合金,E-mail:cbcai@shmtu.edu.cn。

Effect of pulse current on microstructure and mechanical properties of aged Al-Cu-Mn-Zr alloy

Cai Chunbo¹, Gao Shaowei², Gao Guili², Shi Dequan³

1. Logistics Engineering College, Shanghai Maritime University, Shanghai 200135, China;
2. School of Mechanical and Energy Engineering, Shanghai Technical Institute of Electronics and Information, Shanghai 201411, China;
3. School of Materials and Chemistry, University of Shanghai for Science and Technology, Shanghai 200093, China

Received:2022-12-02 Revised:2023-01-12 Published:2023-05-27

摘要/Abstract

摘要： 通过力学性能测试、显微组织和断口形貌观察,研究了脉冲电流密度对Al-Cu-Mn-Zr合金时效后组织及性能的影响,从热力学和动力学角度分析了脉冲电流在铝合金时效过程中的作用机理。结果表明,脉冲电流能够以促进空位跃迁的方式,促进Al-Cu-Mn-Zr合金在时效过程中析出相形核,降低第二相尺寸,使析出相在晶界处由连续分布转为弥散分布。当脉冲电流密度为15 A/mm²时,Al-Cu-Mn-Zr合金的力学性能达到峰值,抗拉强度及断后伸长率分别为444.6 MPa和8.4%,较未施加电脉冲时效处理时分别提高了52.8%和50%。

关键词: 脉冲电流, 时效处理, Al-Cu-Mn-Zr合金, 力学性能, 显微组织

Abstract: Effect of pulse current density on microstructure and mechanical properties of Al-Cu-Mn-Zr alloy after aging was studied by means of mechanical properties testing and microstructure and fracture morphology observation. The mechanism of pulse current in the aging process was analyzed from the point of view of thermodynamics and dynamics. The results show that pulse current promotes the nucleation of precipitated phase of the Al-Cu-Mn-Zr alloy by facilitating vacancy transitions, which reduces the size of second phase and makes the precipitated phase change from continuous to dispersive distribution on the grain boundaries. When the pulse current density is 15 A/mm², the mechanical properties of the Al-Cu-Mn-Zr alloy reach the peak, and the tensile strength and elongation are 444.6 MPa and 8.4%, respectively, which are 52.8% and 50% higher than those without electric pulse.

Key words: pulse current, aging treatment, Al-Cu-Mn-Zr alloy, mechanical properties, microstructure

中图分类号:

TG166.3

蔡春波, 高少伟, 高桂丽, 石德全. 脉冲电流对Al-Cu-Mn-Zr合金时效处理组织及性能的影响[J]. 金属热处理, 2023, 48(4): 104-110.

Cai Chunbo, Gao Shaowei, Gao Guili, Shi Dequan. Effect of pulse current on microstructure and mechanical properties of aged Al-Cu-Mn-Zr alloy[J]. Heat Treatment of Metals, 2023, 48(4): 104-110.

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脉冲电流对Al-Cu-Mn-Zr合金时效处理组织及性能的影响

Effect of pulse current on microstructure and mechanical properties of aged Al-Cu-Mn-Zr alloy

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