多向强应变-时效下7075合金组织、拉伸及抗晶间腐蚀性能

doi:10.13251/j.issn.0254-6051.2021.06.033

金属热处理 ›› 2021, Vol. 46 ›› Issue (6): 168-171.DOI: 10.13251/j.issn.0254-6051.2021.06.033

多向强应变-时效下7075合金组织、拉伸及抗晶间腐蚀性能

曹艳艳, 黄甜甜, 韦春华, 严伟林

广西大学资源环境与材料学院广西有色金属及特色材料加工重点实验室, 广西南宁 530004

收稿日期:2021-02-27 出版日期:2021-06-25 发布日期:2021-07-21
通讯作者: 严伟林,教授,博士,E-mail:yanweilin1962@gxu.edu.cn
作者简介:曹艳艳(1992—),女,硕士研究生,主要研究方向为金属材料及其相关热处理工艺,E-mail:13783584696m@sina.cn。
基金资助:
国家自然科学基金(51561003)

Microstructure, tensile properties and intergranular corrosion resistance of 7075 aluminum alloy under multi-directional severe strain and aging

Cao Yanyan, Huang Tiantian, Wei Chunhua, Yan Weilin

Guangxi Key Laboratory of Processing for Non-ferrous Metal and Featured Materials, School of Resources, Environment and Materials, Guangxi University, Nanning Guangxi 530004, China

Received:2021-02-27 Online:2021-06-25 Published:2021-07-21

摘要/Abstract

摘要： 通过OM、TEM、力学性能和晶间腐蚀测试等手段研究了7075铝合金经多向锻造和80 ℃×1260 min时效处理后的组织及性能变化,并着重分析了试样在不同状态下的抗晶间腐蚀性能。结果表明:试样经多向锻造和80 ℃×1260 min时效处理后,晶粒得到明显细化,强度大幅提升并使塑性保持良好,晶界的析出相呈不连续分布,抗晶间腐蚀性能得到改善。最终,试样的最佳综合性能为:抗拉强度640.25 MPa、伸长率16.59%、自腐蚀电流密度1.077×10^-4 A·cm^-2。

关键词: 7075铝合金, 多向锻造, 时效处理, 强度, 晶间腐蚀

Abstract: Microstructure and properties of 7075 aluminum alloy treated by multi-directional forging and aged at 80 ℃ for 1260 min were studied by means of OM, TEM, mechanical properties and intergranular corrosion testing, and intergranular corrosion resistance of the specimen under different states was analyzed emphatically. The results show that after multi-directional forging and aging, the grains of the specimen are refined obviously, the strength is improved greatly and the plasticity is maintained well, meanwhile, the intergranular corrosion resistance is improved due to the discontinuously distributed grain boundary precipitates. Finally, the obtained optimal comprehensive properties of the specimen are: tensile strength of 640.25 MPa, elongation of 16.59%, and self corrosion current density of 1.077×10^-4 A·cm^-2.

Key words: 7075 aluminum alloy, multi-directional forging, aging treatment, strength, intergranular corrosion

中图分类号:

曹艳艳, 黄甜甜, 韦春华, 严伟林. 多向强应变-时效下7075合金组织、拉伸及抗晶间腐蚀性能[J]. 金属热处理, 2021, 46(6): 168-171.

Cao Yanyan, Huang Tiantian, Wei Chunhua, Yan Weilin. Microstructure, tensile properties and intergranular corrosion resistance of 7075 aluminum alloy under multi-directional severe strain and aging[J]. Heat Treatment of Metals, 2021, 46(6): 168-171.

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多向强应变-时效下7075合金组织、拉伸及抗晶间腐蚀性能

Microstructure, tensile properties and intergranular corrosion resistance of 7075 aluminum alloy under multi-directional severe strain and aging

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