Zn、Mg含量对Al-Zn-Mg-Cu合金组织与性能的影响

doi:10.13251/j.issn.0254-6051.2025.07.031

金属热处理 ›› 2025, Vol. 50 ›› Issue (7): 218-225.DOI: 10.13251/j.issn.0254-6051.2025.07.031

Zn、Mg含量对Al-Zn-Mg-Cu合金组织与性能的影响

黎柏康¹, 秦翔智², 赵佳蕾², 李兵², 赵巍², 章晶林¹, 周毅¹, 李瑞霞¹

1.湖北新金洋资源股份公司, 湖北襄阳 441000;
2.昆山晶微新材料研究院有限公司, 江苏苏州 215100

收稿日期:2025-01-13 修回日期:2025-04-22 出版日期:2025-07-25 发布日期:2025-07-28
作者简介:黎柏康(1980—),男,工程师,主要研究方向为再生资源回收、处置及综合循环利用,再生铝冶炼技术及铝合金材料,E-mail:1961175613@qq.com

Effect of Zn and Mg contents on microstructure and properties of Al-Zn-Mg-Cu alloy

Li Baikang¹, Qin Xiangzhi², Zhao Jialei², Li Bing², Zhao Wei², Zhang Jinglin¹, Zhou Yi¹, Li Ruixia¹

1. Hubei Xinjinyang Resources Co., Ltd., Xiangyang Hubei 441000, China;
2. Kunshan Jingwei New Material Research Institute Co., Ltd., Suzhou Jiangsu 215100, China

Received:2025-01-13 Revised:2025-04-22 Online:2025-07-25 Published:2025-07-28

摘要/Abstract

摘要： 为探究Zn、Mg含量对Al-Zn-Mg-Cu合金组织与性能的影响,通过ICP分析仪、JMatPro软件、扫描电镜、金相显微镜及拉伸试验机等对不同Zn、Mg含量Al-4xZn-xMg-2.0Cu(x=2.0,2.5,3.0,4.0,5.0,6.0)合金组织与性能进行分析。结果表明,Al-4xZn-xMg-2.0Cu(x=2.0,2.5,3.0,4.0,5.0,6.0)合金共晶转变温度约477 ℃,且随着Zn、Mg含量的增加,共晶相占比由3.54%增加到25.06%,晶粒尺寸由138 μm降低至39 μm,这种变化趋势与JMatPro软件计算相一致。合金经轧制、固溶和时效(T6)后的组织为纤维组织+再结晶晶粒,随着Zn、Mg含量的增加,T6态合金板材再结晶晶粒数量减少,尺寸变小,主要归功于小间距的未溶MgZn₂相,具有较好的抑制再结晶效果。此外,随着Zn、Mg含量的增加,T6态合金强度不断增加,且增幅不断增大,但塑性严重降低。其中,Al-16.0Zn-4.0Mg-2.0Cu合金强度最高,抗拉强度683.3 MPa,屈服强度653.3 MPa,但伸长率仅2.3%。

关键词: Zn、Mg含量, Al-Zn-Mg-Cu合金, JMatPro软件, 再结晶, 力学性能

Abstract: In order to explore the effect of Zn and Mg contents on the microstructure and properties of Al-Zn-Mg-Cu alloy, the microstructure and properties of Al-4xZn-xMg-2.0Cu (x=2.0, 2.5, 3.0, 4.0, 5.0, 6.0) alloys with different Zn and Mg contents were analyzed by means of ICP analyzer, JMatPro software, scanning electron microscope, metallographic microscope and tensile testing machine. The results show that the eutectic temperature of the Al-4xZn-xMg-2.0Cu(x=2.0,2.5,3.0,4.0,5.0,6.0) alloy is about 477 ℃, and with the increase of Zn and Mg contents, the eutectic phase proportion increases from 3.54% to 25.06%, and the grain size decreases from 138 μm to 39 μm, which is consistent with the calculation of JMatPro software. The microstructure of the alloy after rolling, solution and aging (T6) is composed of fibrous structure and recrystallized grains. With the increase of Zn and Mg contents, the number of recrystallized grains decreases and the grain size of the alloy plate under T6 state decreases, mainly due to the small spacing of the undissolved MgZn₂ phase, which has a good inhibition effect on recrystallization. In addition, with the increase of Zn and Mg contents, the strength of the alloy under T6 state continues to increase, and the amplitude continues to increase, but the plasticity seriously decreases. Among them, the Al-16.0Zn-4.0Mg-2.0Cu alloy has the highest strength, with a tensile strength of 683.3 MPa and a yield strength of 653.3 MPa, but an elongation of only 2.3%.

Key words: Zn and Mg contents, Al-Zn-Mg-Cu alloy, JMatPro software, recrystallization, mechanical properties

中图分类号:

TG335.5⁺5

黎柏康, 秦翔智, 赵佳蕾, 李兵, 赵巍, 章晶林, 周毅, 李瑞霞. Zn、Mg含量对Al-Zn-Mg-Cu合金组织与性能的影响[J]. 金属热处理, 2025, 50(7): 218-225.

Li Baikang, Qin Xiangzhi, Zhao Jialei, Li Bing, Zhao Wei, Zhang Jinglin, Zhou Yi, Li Ruixia. Effect of Zn and Mg contents on microstructure and properties of Al-Zn-Mg-Cu alloy[J]. Heat Treatment of Metals, 2025, 50(7): 218-225.

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Zn、Mg含量对Al-Zn-Mg-Cu合金组织与性能的影响

Effect of Zn and Mg contents on microstructure and properties of Al-Zn-Mg-Cu alloy

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