自然时效效应及预时效处理对7A20铝合金组织性能的影响

doi:10.13251/j.issn.0254-6051.2020.10.012

金属热处理 ›› 2020, Vol. 45 ›› Issue (10): 60-63.DOI: 10.13251/j.issn.0254-6051.2020.10.012

自然时效效应及预时效处理对7A20铝合金组织性能的影响

姜少婧¹, 王祖平²

1.烟台南山学院, 山东烟台 265713;
2.南山集团矿业公司, 山东烟台 265700

收稿日期:2020-04-05 出版日期:2020-10-25 发布日期:2020-12-29
作者简介:姜少婧(1980—),女,讲师,学士,主要研究方向为金属材料微观组织和力学性能优化, E-mail: jiangshaojing123@163.com
基金资助:
山东省重点研发计划(2019GGX102025)

Effect of natural aging effect and pre-aging treatment on microstructure and properties of 7A20 aluminum alloy

Jiang Shaojing¹, Wang Zuping²

1. Yantai Nanshan University, Yantai Shandong 265713, China;
2. Mining Company, Nanshan Group Co., Ltd., Yantai Shandong 265700, China

Received:2020-04-05 Online:2020-10-25 Published:2020-12-29

摘要/Abstract

摘要： 研究了中强度7A20铝合金的自然时效硬化效应及预时效处理对组织和性能的影响。采用光学显微镜和透射电镜表征了其微观组织结构,采用维氏硬度计和万能拉伸试验机测试了其硬度和力学性能。结果表明:固溶态7A20试验铝合金的自然时效硬化效应明显,12天后硬度由56 HV0.5提高到122 HV0.5,提高了117.86%。经120 ℃×10 min预时效处理后,自然时效硬化增量最低,相比于固溶态降低了16 HV0.5,有效抑制自然时效硬化效应;同时,预时效处理提升了烘烤硬化效应,烘烤硬化后屈服强度提升了166 MPa,抗拉强度提高了51 MPa,伸长率降低了7%。烘烤处理前,其晶内的强化主要来自于与基体共格的GP区,烘烤处理后为尺寸小于5 nm、弥散分布的η′强化相。

关键词: 7A20铝合金, 自然时效, 预时效, 微观组织, 性能

Abstract: Natural aging effect and effect of pre-aging treatment on the microstructure and mechanical properties of 7A20 aluminum alloy were investigated by means of OM, TEM, Vickers hardness tester and multifunctional tensile testing machine. The results indicate that the solution treated 7A20 aluminum alloy has obvious natural aging hardening effect, and the microhardness increases by 117.86% after natural aging for 12 days, from 56 HV0.5 to 122 HV0.5. After the pre-aging treatment at 120 ℃×10 min, the natural aging hardening increment is the lowest, reduced by 16 HV0.5 compared to the solution treated alloy. Simultaneously, this pre-aging treatment improves the baking hardening effect, the yield strength and tensile strength increase by 166 MPa and 51 MPa respectively, while the elongation decreases by 7%. Before the bake hardening process, the strengthening effect in the grains comes mainly from GP zones coherent with the matrix; and after the baking treatment, it comes from dispersed strengthening phase η′ with a size of less than 5 nm.

Key words: 7A20 aluminum alloy, natural aging, pre-aging, microstructure, properties

中图分类号:

TG111.7

姜少婧, 王祖平. 自然时效效应及预时效处理对7A20铝合金组织性能的影响[J]. 金属热处理, 2020, 45(10): 60-63.

Jiang Shaojing, Wang Zuping. Effect of natural aging effect and pre-aging treatment on microstructure and properties of 7A20 aluminum alloy[J]. Heat Treatment of Metals, 2020, 45(10): 60-63.

参考文献

[1]Tucker R. Trends in automotive light weighting[J]. Metal Finishing, 2013, 111(2): 23-25.
[2]Miller W S, Zhuang L, Bottema J, et al. Recent development in aluminum alloys for the automotive industry[J]. Materials Science and Engineering A, 2000, 280(1): 37-49.
[3]Hirsch J. Recent development in aluminum for automotive applications[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(7): 1995-2002.
[4]刘秋平, 刘志勇, 赵俊, 等. Zn含量及回归热处理对7075铝合金性能的影响[J]. 金属热处理, 2016, 41(2): 11-15.
Liu Qiuping, Liu Zhiyong, Zhao Jun, et al. Effect of Zn content and retrogression and re-aging treatment on properties of 7075 aluminum alloy[J]. Heat Treatment of Metals, 2016, 41(2): 11-15.
[5]Hou W R, Ji W B, Zhang Z H, et al. The effect of homogenization temperature on the corrosion resistance of extruded 7050 Al-alloy bars[J]. Journal of Materials Processing Technology, 2014, 214(3): 635-640.
[6]Cong F G, Zhao G, Jiang F, et al. Effect of homogenization treatment on microstructure and mechanical properties of DC cast 7X50 aluminum alloy[J]. Transactions of Nonferrous Metals Society of China, 2015, 25(4): 1027-1034.
[7]Jiang F L, Zurob H S, Purdy G R, et al. Characterizing precipitate evolution of an Al-Zn-Mg-Cu based commercial alloy during artificial aging and non-isothermal heat treatments by in situ electrical resistivity monitoring[J]. Materials Characterization, 2016, 117: 47-56.
[8]Guo W, Guo J Y, Wang J D, et al. Evolution of precipitate microstructure during stress aging of an Al-Zn-Mg-Cu alloy[J]. Materials Science and Engineering A, 2015, 634: 167-175.
[9]李辉, 李铸铁, 晋宏炎, 等. 预时效及烤漆硬化处理对6016铝合金显微组织及硬度的影响[J]. 金属热处理, 2017, 42(11): 148-151.
Li Hui, Li Zhutie, Jin Hongyan, et al. Influence of pre-aging and bake hardening on microstructure and hardness of 6016 aluminum alloy[J]. Heat Treatment of Metals, 2017, 42(11): 148-151.
[10]Cao C, Zhang D, Zhuang L Z, et al. Improved age-hardening response and altered precipitation behavior of Al-5.2Mg-0.45Cu-2.0Zn alloy with pre-aging treatment[J]. Journal of Alloys and Compounds, 2017, 691: 40-43.
[11]Lee Y S, Koh D H, Kim H W, et al. Improved bake-hardening response of Al-Zn-Mg-Cu alloy through pre-aging treatment[J]. Scripta Materialia, 2018, 147: 45-49.
[12]Ghiaasiaan R, Amirkhiz B S, Shankar S. Quantitative metallography of precipitating and secondary phases after strengthening treatment of net shaped casting of Al-Zn-Mg-Cu (7000) alloys[J]. Materials Science and Engineering A, 2017, 698: 206-217.

[1]	王玉岱, 刘洋, 朱言言, 田象军, 程序, 冉先喆, 钱婷婷. 热处理对复合制造AerMet100超高强度钢组织均匀性与拉伸性能的影响[J]. 金属热处理, 2022, 47(4): 1-9.
[2]	张子延, 陈君, 陈晓亚, 李全安, 刘建鑫. 固溶时效处理对Mg-4Sm-3Gd-0.5Zr合金显微组织和耐蚀性能的影响[J]. 金属热处理, 2022, 47(4): 10-16.
[3]	梁恩溥, 徐乐, 杨勇, 王毛球. 添加Al、Cu对40CrNi3MoV钢组织和力学性能的影响[J]. 金属热处理, 2022, 47(4): 17-23.
[4]	祁晓亮, 李岩, 定巍, 赵增武. 含Al中锰TRIP钢原始组织对临界退火后组织与力学性能的影响[J]. 金属热处理, 2022, 47(4): 24-29.
[5]	陈保安, 张静媛, 祝志祥, 韩钰, 潘学东, 张磊, 陈素红. 化学成分对高强Al-Mg-Si合金组织和性能的影响[J]. 金属热处理, 2022, 47(4): 30-38.
[6]	陈东俊, 李广阳, 刘刚. 时效处理对AlSi9Cu3压铸铝合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(4): 53-56.
[7]	陈连生, 张露友, 田亚强, 杨子旋, 李红斌, 潘红波, 魏英立. 低碳高强舰船用钢的CCT曲线及其组织性能[J]. 金属热处理, 2022, 47(4): 63-68.
[8]	王云龙, 余伟, 张昳, 史佳新, 李明辉. 奥氏体化温度对贝氏体钢等温转变及力学性能的影响[J]. 金属热处理, 2022, 47(4): 80-85.
[9]	陈思君, 陈送义, 陈庚, 袁丁玲, 陈康华. Mg含量对2A14铝合金组织和力学性能的影响[J]. 金属热处理, 2022, 47(4): 86-92.
[10]	骆再斌, 范子泽, 彭振. 轻质高熵合金的研究进展[J]. 金属热处理, 2022, 47(4): 100-107.
[11]	白青青, 张志宏, 郑淮北, 王英虎. 2507超级双相不锈钢中σ相的析出行为[J]. 金属热处理, 2022, 47(4): 108-115.
[12]	陈刚, 罗小兵, 柴锋, 杨才福, 张正延, 杨丽. 轧制加热温度对高强度低合金钢组织及冲击性能的影响[J]. 金属热处理, 2022, 47(4): 116-121.
[13]	李立, 曾艳, 吴晓春. 4Cr5Mo2VCo钢的热处理工艺优化[J]. 金属热处理, 2022, 47(4): 133-140.
[14]	吕杰晟, 宋志刚, 何建国, 丰涵, 郑文杰, 朱玉亮. S32205双相不锈钢冷轧退火组织转变及强塑化机理分析[J]. 金属热处理, 2022, 47(4): 141-145.
[15]	王琪, 吴光亮. 回火温度对1100 MPa级高强钢组织与性能的影响[J]. 金属热处理, 2022, 47(4): 146-150.

自然时效效应及预时效处理对7A20铝合金组织性能的影响

Effect of natural aging effect and pre-aging treatment on microstructure and properties of 7A20 aluminum alloy

PDF

可视化

摘要/Abstract

引用本文

使用本文

参考文献

相关文章 15

编辑推荐

Metrics

本文评价