Microstructure, microhardness and mechanical behavior of dissimilar AA7075/AA6061 alloys under friction stir welding

IF 1.9 3区工程技术 Q3 ENGINEERING, MANUFACTURING

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture Pub Date : 2024-02-08 DOI:10.1177/09544054241229476

Hepeng Jia, Kai Wu

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引用次数: 0

Abstract

Friction stir welding (FSW) of dissimilar AA6061 and AA7075 aluminum alloys faces challenges such as an unclear forming mechanism and low welding efficiency. In order to improve welding efficiency and elucidate the variations in metallography, Microhardness, and mechanical properties of dissimilar alloy FSW joints, this article designed FSW experiments using the Taguchi method with welding speeds ranging from 600 to 1000 mm/min. We studied the relationship between material mixing and welding defects through macroscopic metallography, microscopic metallography, and Microhardness, while the impact of welding parameters on the microstructure and properties was evaluated. The results show that void defects do not exist in dissimilar alloy FSW joints, and the Microhardness changes are “U” and “W” shaped. Material mixing played a decisive role in determining the microstructure and properties of dissimilar aluminum alloy FSW joints, with increased rotational speed enhancing material flow. The order of influence on the mechanical properties of the joint was found to be plunge depth, welding speed, and rotational speed. Under the conditions of 1000 mm/min, 2400 rpm, and 0.25 mm, the yield strength (YS) and ultimate tensile strength (UTS) of the dissimilar alloy FSW joints reached 87.3% and 73.4% of the AA6061-T6 alloy, respectively.

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搅拌摩擦焊下异种 AA7075/AA6061 合金的显微结构、显微硬度和机械性能

异种 AA6061 和 AA7075 铝合金的搅拌摩擦焊（FSW）面临着成型机制不明确和焊接效率低等挑战。为了提高焊接效率并阐明异种合金 FSW 接头在金相、显微硬度和机械性能方面的变化，本文采用田口方法设计了焊接速度为 600 至 1000 mm/min 的 FSW 实验。我们通过宏观金相、微观金相和显微硬度研究了材料混合与焊接缺陷之间的关系，同时评估了焊接参数对微观结构和性能的影响。结果表明，异种合金 FSW 接头不存在空隙缺陷，显微硬度变化呈 "U "形和 "W "形。材料混合在决定异种铝合金 FSW 接头的微观结构和性能方面起着决定性作用，转速的提高会增强材料的流动性。对接头机械性能的影响顺序依次为切入深度、焊接速度和旋转速度。在 1000 mm/min、2400 rpm 和 0.25 mm 的条件下，异种合金 FSW 接头的屈服强度（YS）和极限拉伸强度（UTS）分别达到 AA6061-T6 合金的 87.3% 和 73.4%。

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

Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 工程技术-工程：机械

CiteScore

5.10

自引率

30.80%

发文量

167

审稿时长

5.1 months

期刊介绍： Manufacturing industries throughout the world are changing very rapidly. New concepts and methods are being developed and exploited to enable efficient and effective manufacturing. Existing manufacturing processes are being improved to meet the requirements of lean and agile manufacturing. The aim of the Journal of Engineering Manufacture is to provide a focus for these developments in engineering manufacture by publishing original papers and review papers covering technological and scientific research, developments and management implementation in manufacturing. This journal is also peer reviewed. Contributions are welcomed in the broad areas of manufacturing processes, manufacturing technology and factory automation, digital manufacturing, design and manufacturing systems including management relevant to engineering manufacture. Of particular interest at the present time would be papers concerned with digital manufacturing, metrology enabled manufacturing, smart factory, additive manufacturing and composites as well as specialist manufacturing fields like nanotechnology, sustainable & clean manufacturing and bio-manufacturing. Articles may be Research Papers, Reviews, Technical Notes, or Short Communications.