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三种异种铝合金搅拌摩擦焊缝的焊核形成及力学行为

Nugget Formation and Mechanical Behaviour of Friction Stir Welds of Three Dissimilar Aluminum Alloys.

作者信息

Manuel Neves, Galvão Ivan, Leal Rui M, Costa José D, Loureiro Altino

机构信息

CEMMPRE, Departamento de Engenharia Mecânica, Universidade de Coimbra, Rua Luís Reis Santos, 3030-788 Coimbra, Portugal.

Escola Superior Politécnica do Namibe, Rua Amílcar Cabral, Moçâmedes 201, Angola.

出版信息

Materials (Basel). 2020 Jun 11;13(11):2664. doi: 10.3390/ma13112664.

DOI:10.3390/ma13112664
PMID:32545259
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7321648/
Abstract

The aim of this research was to investigate the influence of the properties of the base materials and welding speed on the morphology and mechanical behavior of the friction stir welds of three dissimilar aluminum alloys in a T-joint configuration. The base materials were the AA2017-T4, AA5083-H111, and AA6082-T6 alloys in 3 mm-thick sheets. The AA6082-T6 alloy was the stringer, and the other alloys were located either on the advancing or retreating sides of the skin. All the T-joint welds were produced with a constant tool rotation speed but with different welding speeds. The microstructures of the welds were analyzed using optical microscopy, scanning electron microscopy with energy dispersive spectroscopy, and the electron backscatter diffraction technique. The mechanical properties were assessed according to micro-hardness, tensile, and fatigue testing. Good quality welds of the three dissimilar aluminum alloys could be achieved with friction stir welding, but a high ratio between the tool's rotational and traverse speeds was required. The welding speed influenced the weld morphology and fatigue strength. The positioning of the skin materials influenced the nugget morphology and the mechanical behavior of the joints. The joints in which the AA2017 alloy was positioned on the advancing side presented the best tensile properties and fatigue strength.

摘要

本研究的目的是调查基材性能和焊接速度对T型接头配置中三种异种铝合金搅拌摩擦焊缝的微观结构和力学行为的影响。基材为3毫米厚板材中的AA2017-T4、AA5083-H111和AA6082-T6合金。AA6082-T6合金为桁条，其他合金位于蒙皮的前进侧或后退侧。所有T型接头焊缝均以恒定的工具转速但不同的焊接速度进行焊接。使用光学显微镜、带能谱的扫描电子显微镜和电子背散射衍射技术对焊缝的微观结构进行了分析。根据显微硬度、拉伸和疲劳试验评估力学性能。采用搅拌摩擦焊可以实现三种异种铝合金的高质量焊接，但需要工具旋转速度和横向速度之间有较高的比率。焊接速度影响焊缝微观结构和疲劳强度。蒙皮材料的位置影响了焊核微观结构和接头的力学行为。AA2017合金位于前进侧的接头具有最佳的拉伸性能和疲劳强度。

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