固溶处理对稀土改性Al-Zn-Mg-Cu合金组织及性能的影响

doi:10.13251/j.issn.0254-6051.2023.03.006

金属热处理 ›› 2023, Vol. 48 ›› Issue (3): 32-38.DOI: 10.13251/j.issn.0254-6051.2023.03.006

固溶处理对稀土改性Al-Zn-Mg-Cu合金组织及性能的影响

邓红玲, 张思雨, 钟辉隆, 李声慈, 齐亮, 陈继强

江西理工大学材料冶金化学学部, 江西赣州 341000

收稿日期:2022-10-24 修回日期:2022-12-30 出版日期:2023-03-25 发布日期:2023-04-25
通讯作者: 李声慈,副教授,博士,E-mail:lishengci1988@163.com。
作者简介:邓红玲(1999—),女,学士,主要研究方向为高性能铝合金材料,E-mail:3303013317@qq.com。
基金资助:
国家自然科学基金(52264054),江西省离子型稀土资源绿色开发与高值利用国家重点实验室培育计划(20194AFD44003),江西省主要学科学术和技术带头人培养计划—领军人才项目(20213BCJL22042),江西省大学生创新创业训练计划(S202110407003)

Effect of solution treatment on microstructure and properties of rare earth modified Al-Zn-Mg-Cu alloy

Deng Hongling, Zhang Siyu, Zhong Huilong, Li Shengci, Qi Liang, Chen Jiqiang

Faculty of Materials Metallurgy and Chemistry, Jiangxi University of Science and Technology, Ganzhou Jiangxi 341000, China

Received:2022-10-24 Revised:2022-12-30 Online:2023-03-25 Published:2023-04-25

摘要/Abstract

摘要： 采用OM、SEM、EDS和室温拉伸等方法,研究了475 ℃下固溶时间对不同成分Al-Zn-Mg-Cu合金(7055、7055-Pr、7055-Er、7055-Pr-Er合金)组织性能的影响规律。结果表明,4种合金的强度均随固溶时间的增加先升高后下降;稀土Pr、Er的添加可以减少基体中的残留相、细化晶粒,从而改善合金的伸长率;稀土Pr比稀土Er具有更好的提升合金伸长率的效果,而稀土Er对合金强度提升影响较大。适当的固溶处理可以优化基体中残留相和第二相的数量与尺寸,从而影响合金断口形貌与力学性能,在475 ℃固溶60 min后7055-Er合金的抗拉强度达到最大值,为665 MPa,而7055-Pr合金的伸长率达到最高值,为14.9%。

关键词: 铝合金, 热处理, 稀土元素, 显微组织, 力学性能

Abstract: Effects of solution treatment time at 475 ℃ on the microstructure and properties of Al-Zn-Mg-Cu alloys with different contents(7055, 7055-Pr, 7055-Er, 7055-Pr-Er alloys) were studied by OM, SEM, EDS and tensile test. The results show that the strengths of the four alloys all increase firstly and then decrease with the increase of solution treatment time. The addition of rare earth Pr and Er can reduce the residual phases in the matrix, refine the grains, thereby improving the elongation of the alloys. The rare earth Pr has a better effect on improving elongation of the tested alloy than the rare earth Er, while the Er has a greater effect on the strength improvement of the tested alloy. Appropriate solution treatment can optimize the number and size of residual phases and secondary phases in the matrix, thereby affecting the fracture morphologies and mechanical properties of the alloys. After solution treatment at 475 ℃ for 60 min, the tensile strength of the 7055-Er alloy reaches the maximum value of 665 MPa, while the elongation of the 7055-Pr alloy reaches the maximum value of 14.9%.

Key words: aluminum alloy, heat treatment, rare earth, microstructure, mechanical properties

中图分类号:

TG146.2

邓红玲, 张思雨, 钟辉隆, 李声慈, 齐亮, 陈继强. 固溶处理对稀土改性Al-Zn-Mg-Cu合金组织及性能的影响[J]. 金属热处理, 2023, 48(3): 32-38.

Deng Hongling, Zhang Siyu, Zhong Huilong, Li Shengci, Qi Liang, Chen Jiqiang. Effect of solution treatment on microstructure and properties of rare earth modified Al-Zn-Mg-Cu alloy[J]. Heat Treatment of Metals, 2023, 48(3): 32-38.

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固溶处理对稀土改性Al-Zn-Mg-Cu合金组织及性能的影响

Effect of solution treatment on microstructure and properties of rare earth modified Al-Zn-Mg-Cu alloy

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