Improving microstructure, tensile properties and corrosion resistance of AA6016 and AA2519 alloys friction stir lap joints via TIG arc

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING

Transactions of Nonferrous Metals Society of China Pub Date : 2025-02-01 DOI:10.1016/S1003-6326(24)66688-4

Tie YI , Sheng-dan LIU , Chen FANG , Geng-duo JIANG , Xuan-xuan DAI

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Abstract

The effects of tungsten inert gas arc-assisted friction stir welding (TIG-FSW) on the microstructure, tensile properties and corrosion resistance of AA6016 and AA2519 alloys lap joints were investigated by means of optical microscope, scanning electron microscope, tensile test at room temperature, corrosion immersion tests and electrochemical measurements. The results show that the introduction of TIG arc during FSW process results in a more uniform microstructure of the joint with no tunnel hole defects. Furthermore, it enhances tensile strength and elongation of the joint with increased rates of 11.5% and 50.0%, respectively; meanwhile, the corrosion current density and largest corrosion depth are decreased with reduction rates of 78.2% and 45.7%, respectively. TIG-FSW can promote flow, contact and diffusion of materials, thus improving microstructure of the joint. Additionally, it reduces the size and number of secondary phase particles. Consequently, these factors contribute to the higher tensile properties and corrosion resistance of the joints.

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通过TIG电弧改善AA6016和AA2519合金搅拌摩擦搭接接头的组织、拉伸性能和耐蚀性

采用光学显微镜、扫描电镜、室温拉伸试验、浸泡腐蚀试验和电化学测试等手段，研究了钨惰性气体电弧辅助搅拌摩擦焊（TIG-FSW）对AA6016和AA2519合金搭接接头组织、拉伸性能和耐蚀性的影响。结果表明：在FSW过程中引入TIG电弧，使接头组织更加均匀，无隧道孔缺陷；提高了接头的抗拉强度和伸长率，分别提高了11.5%和50.0%；同时，腐蚀电流密度和最大腐蚀深度降低，降低率分别为78.2%和45.7%。TIG-FSW可以促进材料的流动、接触和扩散，从而改善接头的微观组织。此外，它还减少了二次相颗粒的尺寸和数量。因此，这些因素有助于提高接头的拉伸性能和耐腐蚀性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.