时效处理对7022铝合金组织与弯曲性能的影响

doi:10.13251/j.issn.0254-6051.2022.07.026

金属热处理 ›› 2022, Vol. 47 ›› Issue (7): 144-150.DOI: 10.13251/j.issn.0254-6051.2022.07.026

时效处理对7022铝合金组织与弯曲性能的影响

殷剑¹, 金康^1,2, 黎诚², 董奇³, 沈智⁴, 张波²

1.北京机电研究所有限公司, 北京 100083;
2.中机精密成形产业技术研究院(安徽)股份有限公司, 安徽芜湖 241000;
3.合肥学院先进制造工程学院, 安徽合肥 230601;
4.南昌工程学院机械工程学院, 江西南昌 330099

收稿日期:2022-03-16 修回日期:2022-05-26 出版日期:2022-07-25 发布日期:2022-08-12
通讯作者: 金康,高级工程师,硕士,E-mail:jinkang@cmipf.com
作者简介:殷剑(1997—),男,硕士研究生,主要研究方向为铝合金精密成形,E-mail:a18726451924@163.com。

Effect of aging on microstructure and bending properties of 7022 aluminum alloy

Yin Jian¹, Jin Kang^1,2, Li Cheng², Dong Qi³, Shen Zhi⁴, Zhang Bo²

1. Beijing Research Institute of Mechanical and Electrical Technology, Beijing 100083, China;
2. China Machinery Industry Technology Research Institute of Precision Forming, Wuhu Anhui 241000, China;
3. School of Advanced Manufacturing Engineering, Hefei University, Hefei Anhui 230601, China;
4. School of Mechanical Engineering, Nanchang Institute of Technology, Nanchang Jiangxi 330099, China

Received:2022-03-16 Revised:2022-05-26 Online:2022-07-25 Published:2022-08-12

摘要/Abstract

摘要： 采用扫描电镜(SEM)、能谱分析(EDS)、X射线衍射(XRD)、电子背散射衍射(EBSD)、拉伸和弯曲试验等研究了时效处理对7022铝合金组织及弯曲性能的影响。结果表明,固溶处理后7022铝合金基体中依然含有大量黑色不溶第二相,且这些相主要由α-Al、MgZn₂、Al₂CuMg和Al₇Cu₂Fe相组成。随着时效的进行,Al₂CuMg和Al₇Cu₂Fe相逐渐溶解,与MgZn₂相性质相似的Mg(Zn, Cu, Al)₂相析出,同时晶粒逐渐长大,产生明显的析出强化效应。试样的抗弯强度主要受到第二相颗粒的数目、尺寸以及晶粒尺寸的影响。110 ℃×10 h时效条件下,合金拥有弥散分布的细小第二相颗粒和合适的晶粒尺寸,具有较好的抗弯强度和抗拉强度,其数值分别为21.7 MPa、608 MPa。

关键词: 7022铝合金, 弯曲性能, 时效处理, 显微组织, 力学性能

Abstract: Effect of aging treatment on microstructure and mechanical properties of 7022 aluminum alloy was studied by means of scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) analysis, X-ray diffraction (XRD), electron backscatter diffraction (EBSD), tensile and bending test. The results show that the 7022 aluminum alloy matrix after solution treatment still contains a large amount of black insoluble second phases and these phases are mainly composed of α-Al, MgZn₂, Al₂CuMg and Al₇Cu₂Fe phases. As the aging progresses, the Al₂CuMg and Al₇Cu₂Fe phases gradually dissolve, and the Mg(Zn, Cu, Al)₂ phase, which is similar in properties to the MgZn₂ phase, precipitates, and the grains grow gradually, resulting in an obvious precipitation strengthening effect. The bending strength of the specimen is mainly affected by the number and size of the second phase particles and grain size. Under the aging condition at 110 ℃ for 10 h, the alloy with dispersed fine second phase particles and suitable grain size has better bending strength and tensile strength, and the values are 21.7 MPa and 608 MPa, respectively.

Key words: 7022 aluminum alloy, bending properties, aging treatment, microstructure, mechanical properties

中图分类号:

TG146.2

殷剑, 金康, 黎诚, 董奇, 沈智, 张波. 时效处理对7022铝合金组织与弯曲性能的影响[J]. 金属热处理, 2022, 47(7): 144-150.

Yin Jian, Jin Kang, Li Cheng, Dong Qi, Shen Zhi, Zhang Bo. Effect of aging on microstructure and bending properties of 7022 aluminum alloy[J]. Heat Treatment of Metals, 2022, 47(7): 144-150.

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时效处理对7022铝合金组织与弯曲性能的影响

Effect of aging on microstructure and bending properties of 7022 aluminum alloy

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