7050高强铝合金铆钉丝材T73双级时效工艺

doi:10.13251/j.issn.0254-6051.2023.03.019

金属热处理 ›› 2023, Vol. 48 ›› Issue (3): 112-117.DOI: 10.13251/j.issn.0254-6051.2023.03.019

7050高强铝合金铆钉丝材T73双级时效工艺

李惠曲^1,2, 王亮^1,2, 臧金鑫^1,2, 郝敏^1,2, 陈军洲^1,2

1.中国航发北京航空材料研究院, 北京 100095;
2.北京市先进铝合金材料及应用工程技术研究中心, 北京 100095

收稿日期:2022-09-30 修回日期:2022-12-30 出版日期:2023-03-25 发布日期:2023-04-25
作者简介:李惠曲(1971—),女,高级工程师,学士,主要研究方向为高性能铝合金,E-mail:leehuiqu@163.com。

T73 two-stage aging process of 7050 high-strength aluminum alloy rivet wire

Li Huiqu^1,2, Wang Liang^1,2, Zang Jinxin^1,2, Hao Min^1,2, Chen Junzhou^1,2

1. AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;
2. Beijing Engineering Research Center of Advanced Aluminum Alloys and Applications, Beijing 100095, China

Received:2022-09-30 Revised:2022-12-30 Online:2023-03-25 Published:2023-04-25

摘要/Abstract

摘要： 针对国产7050高强铝合金铆钉丝材,采用室温拉伸、室温剪切、镦粗试验的方法,研究了经177~182 ℃不同二级时效时间后7050铝合金丝材的性能。利用扫描电镜(SEM)、透射电镜(TEM)观察合金不同时效工艺下断口组织和析出相形貌特征。结果表明,拉伸强度和剪切强度随二级时效温度的升高、二级时效时间的延长逐渐降低,剪切强度低于330 MPa时镦粗试样不开裂。TEM微观组织显示,随二级时效温度的升高、时间的延长析出相形貌变化不大,但析出相的尺寸随时效温度的升高逐渐长大、间距逐渐增大;拉伸断口形貌显示,二级时效的断裂方式均为韧窝断裂和沿晶断裂的混合断裂模式,随二级时效温度的升高和保温时间的延长,断口中韧窝数量逐渐增加且尺寸变大,沿晶断裂逐渐减少。

关键词: 7050高强铝合金, 铆钉丝材, T73热处理, 微观组织, 断裂行为

Abstract: Properties of the domestic 7050 high strength aluminum alloy wire secondary aged at 177-182 ℃ for different time were studied by room temperature tensile, room temperature shearing and upsetting tests. The fracture morphology was studied by means of scanning electron microscope (SEM) and the precipitation phase was studied by means of transmission electron microscope (TEM). The results show that the tensile strength and the shearing strength decrease gradually with the increase of secondary aging temperature and secondary aging time. The upsetting specimens do not crack when the shear strength is less than 330 MPa. The TEM microstructure show that the higher the aging temperature and the long the aging time, the larger the size and the inter-spacing of precipitated phase are, but morphology of precipitated phase changes little. The tensile fracture morphologies show that the fracture mode is a mixture of ductile fracture and intergranular fracture. The dimple number and size increase and the intergranular fracture decreases with the increase of secondary aging temperature and aging time.

Key words: 7050 high strength aluminum alloy, rivet wire, T73 heat treatment, microstructure, fracture

中图分类号:

TG146.2

李惠曲, 王亮, 臧金鑫, 郝敏, 陈军洲. 7050高强铝合金铆钉丝材T73双级时效工艺[J]. 金属热处理, 2023, 48(3): 112-117.

Li Huiqu, Wang Liang, Zang Jinxin, Hao Min, Chen Junzhou. T73 two-stage aging process of 7050 high-strength aluminum alloy rivet wire[J]. Heat Treatment of Metals, 2023, 48(3): 112-117.

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7050高强铝合金铆钉丝材T73双级时效工艺

T73 two-stage aging process of 7050 high-strength aluminum alloy rivet wire

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