Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion
In this investigation, gas tungsten arc welding (GTAW) and gas tungsten arc welding with trailing ultrasonic rotating extrusion (U-RE-GTAW) were applied to 7075 aluminum alloys. Qualitative comparisons and analyses were carried out to investigate the effects of the ultrasonic rotary extrusion-assist...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424021434 |
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| author | Rongtao Zhu Xinghong Ji Bo Yuan Zhaofeng Liang Peng Du Liang Zhang Zhiwen Xie |
| author_facet | Rongtao Zhu Xinghong Ji Bo Yuan Zhaofeng Liang Peng Du Liang Zhang Zhiwen Xie |
| author_sort | Rongtao Zhu |
| collection | DOAJ |
| description | In this investigation, gas tungsten arc welding (GTAW) and gas tungsten arc welding with trailing ultrasonic rotating extrusion (U-RE-GTAW) were applied to 7075 aluminum alloys. Qualitative comparisons and analyses were carried out to investigate the effects of the ultrasonic rotary extrusion-assisted technology on GTAW processes. The weld joints fabricated by GTAW and U-RE-GTAW were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. Concurrently, the tensile strength and fatigue characteristics were assessed at ambient temperature. The experimental outcomes indicated that the U-RE-GTAW process mitigated porosity within the weld region and substantially augmented dislocation density, while concurrently achieving a notable reduction in grain size and an increase in the volume fraction of secondary phases due to the synergistic effects of ultrasonic oscillation and rotational extrusion. The enhancement in tensile and fatigue resistance of the welded joint was attributed to the strengthening mechanisms associated with these microstructural alterations. Specifically, the ultimate tensile strength exhibited a 20.4% increase, and the elongation at break was elevated by 46.3%. At stress amplitudes of 190 MPa, 160 MPa, and 100 MPa, the fatigue strength of the welded joints was enhanced by 67%, 55%, and 32%, respectively. A quantitative analysis was conducted to elucidate the impact of diverse strengthening mechanisms on the welded joints. It was concluded that dislocation strengthening is the predominant factor contributing to the superior performance of the U-RE-GTAW specimens. |
| format | Article |
| id | doaj-art-19d8e23b10d044b5a28fc6c79456a3c6 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-19d8e23b10d044b5a28fc6c79456a3c62024-12-26T08:53:50ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013314461459Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusionRongtao Zhu0Xinghong Ji1Bo Yuan2Zhaofeng Liang3Peng Du4Liang Zhang5Zhiwen Xie6Institute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, China; School of Mechanical Engineering and Automation, Liaoning Science and Technology University, Anshan, 114051, ChinaInstitute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, ChinaInstitute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, ChinaInstitute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, ChinaInstitute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, ChinaInstitute of Intelligent Manufacturing Technology, Shenzhen Polytechnic University, Shenzhen, 518055, China; Corresponding author.School of Mechanical Engineering and Automation, Liaoning Science and Technology University, Anshan, 114051, China; Corresponding author.In this investigation, gas tungsten arc welding (GTAW) and gas tungsten arc welding with trailing ultrasonic rotating extrusion (U-RE-GTAW) were applied to 7075 aluminum alloys. Qualitative comparisons and analyses were carried out to investigate the effects of the ultrasonic rotary extrusion-assisted technology on GTAW processes. The weld joints fabricated by GTAW and U-RE-GTAW were examined using X-ray diffraction (XRD), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission electron microscopy (TEM) techniques. Concurrently, the tensile strength and fatigue characteristics were assessed at ambient temperature. The experimental outcomes indicated that the U-RE-GTAW process mitigated porosity within the weld region and substantially augmented dislocation density, while concurrently achieving a notable reduction in grain size and an increase in the volume fraction of secondary phases due to the synergistic effects of ultrasonic oscillation and rotational extrusion. The enhancement in tensile and fatigue resistance of the welded joint was attributed to the strengthening mechanisms associated with these microstructural alterations. Specifically, the ultimate tensile strength exhibited a 20.4% increase, and the elongation at break was elevated by 46.3%. At stress amplitudes of 190 MPa, 160 MPa, and 100 MPa, the fatigue strength of the welded joints was enhanced by 67%, 55%, and 32%, respectively. A quantitative analysis was conducted to elucidate the impact of diverse strengthening mechanisms on the welded joints. It was concluded that dislocation strengthening is the predominant factor contributing to the superior performance of the U-RE-GTAW specimens.http://www.sciencedirect.com/science/article/pii/S22387854240214347075 aluminum alloyTungsten inert gas weldingUltrasonic rotating extrusionDeformation mechanismStrengthening mechanism |
| spellingShingle | Rongtao Zhu Xinghong Ji Bo Yuan Zhaofeng Liang Peng Du Liang Zhang Zhiwen Xie Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion Journal of Materials Research and Technology 7075 aluminum alloy Tungsten inert gas welding Ultrasonic rotating extrusion Deformation mechanism Strengthening mechanism |
| title | Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| title_full | Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| title_fullStr | Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| title_full_unstemmed | Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| title_short | Microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| title_sort | microstructure and mechanical properties of 7075 aluminum alloy welds by gas tungsten arc welding with trailing ultrasonic rotating extrusion |
| topic | 7075 aluminum alloy Tungsten inert gas welding Ultrasonic rotating extrusion Deformation mechanism Strengthening mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424021434 |
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