Microstructure and Mechanical Properties of 7075 Al Alloy TIG-Welded Joint with 7075 Al Alloy Wire as Filler

IF 1.6 4区材料科学 Q2 Materials Science Transactions of The Indian Institute of Metals Pub Date : 2024-05-20 DOI:10.1007/s12666-024-03352-6

Hao Kang, Yang Zhang, Ning Zhang, Kaiming Wang, Jiabei Du, Keliang Ma

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Abstract

Arc welding of Al–Zn–Mg–Cu (7xxx) high-strength Al alloys is an urgent problem to be solved. In this study, tungsten inert gas (TIG) welding of 7075 Al alloy with newly developed 7075 Al alloy wire as filler is successfully carried out and the full-penetration and defect-free joint is formed. The fusion zone (FZ) is consisted of fine and equiaxed α-Al dendrites and a narrow transition zone (TZ) with columnar α-Al grains is formed between the heat-affected zone (HAZ) and FZ. The minimum hardness is obtained in FZ in 7075 Al alloy-welded joints and post-weld heat treatment (PWHT, solid solutioned at 480℃ for 1 h and then aging at 120℃ for 24 h) induces significant hardening in both FZ and HAZ due to the precipitation of GP zones and η' phase. The yield strength, ultimate tensile strength and ductility of as-welded joint are 223 MPa, 374 MPa and 4.6%, and they are improved to 435 MPa, 533 MPa and 7.8%, respectively, after PWHT. The high-strength coefficient for 7075 Al alloy TIG-welded joint can be attributed to the 7075Al alloy wire filler, optimized TIG welding parameters and PWHT.

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以 7075 Al 合金焊丝为填充物的 7075 Al 合金氩弧焊接的显微结构和力学性能

铝-锌-镁-铜（7xxx）高强度铝合金的电弧焊接是一个亟待解决的问题。本研究以新开发的 7075 Al 合金焊丝为填料，成功进行了 7075 Al 合金的钨极惰性气体（TIG）焊接，并形成了全熔透、无缺陷的焊点。熔合区（FZ）由细小的等轴α-Al树枝状晶粒组成，在热影响区（HAZ）和熔合区（FZ）之间形成了一个由柱状α-Al晶粒组成的狭窄过渡区（TZ）。在 7075 Al 合金焊接接头中，FZ 的硬度最低，焊后热处理（PWHT，在 480℃ 固溶 1 小时，然后在 120℃ 时效 24 小时）由于 GP 区和η'相的析出，导致 FZ 和 HAZ 显著硬化。焊接接头的屈服强度、极限抗拉强度和延展性分别为 223 MPa、374 MPa 和 4.6%，而在 PWHT 后分别提高到 435 MPa、533 MPa 和 7.8%。7075 Al 合金氩弧焊接头的高强度系数可归因于 7075 Al 合金焊丝填充物、优化的氩弧焊参数和 PWHT。

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来源期刊

Transactions of The Indian Institute of Metals Materials Science-Metals and Alloys

CiteScore

2.60

自引率

6.20%

发文量

期刊介绍： Transactions of the Indian Institute of Metals publishes original research articles and reviews on ferrous and non-ferrous process metallurgy, structural and functional materials development, physical, chemical and mechanical metallurgy, welding science and technology, metal forming, particulate technologies, surface engineering, characterization of materials, thermodynamics and kinetics, materials modelling and other allied branches of Metallurgy and Materials Engineering. Transactions of the Indian Institute of Metals also serves as a forum for rapid publication of recent advances in all the branches of Metallurgy and Materials Engineering. The technical content of the journal is scrutinized by the Editorial Board composed of experts from various disciplines of Metallurgy and Materials Engineering. Editorial Advisory Board provides valuable advice on technical matters related to the publication of Transactions.