Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties
Aluminum alloys have widespread use due to their superior properties. However, it exhibits complex effects with its various intermetallic compounds formed by clustering of other elements in its welded joints. In this study, electron beam welding (EBW) of the 7075 aluminum alloys (Al-alloys) was exam...
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| Format: | Article |
| Language: | English |
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Elsevier
2022-10-01
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| Series: | Engineering Science and Technology, an International Journal |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2215098622000015 |
| _version_ | 1817984926950096896 |
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| author | Fatih Hayat |
| author_facet | Fatih Hayat |
| author_sort | Fatih Hayat |
| collection | DOAJ |
| description | Aluminum alloys have widespread use due to their superior properties. However, it exhibits complex effects with its various intermetallic compounds formed by clustering of other elements in its welded joints. In this study, electron beam welding (EBW) of the 7075 aluminum alloys (Al-alloys) was examined. Two different welding current values are used in the welding process (20 and 25 mA). The welded specimens were subjected to tensile testing to determine their mechanical properties. In addition, the fractured surfaces were examined. The microhardness, scanning electron microscopy (SEM) and energy-dispersive spectroscopy analysis (EDS), EDS line analysis and EDS mapping were conducted. The microstructural evolution of EB welded plates investigated in the base metal (BM), heat affected zone (HAZ), and fusion zone (FZ), using SEM. Results indicated that after EBW, microhardness increment was observed in the FZ as compared to the BM and HAZ. The lowest hardness was observed in HAZ. The intermetallic formations in the FZ, and the effects of the elements on fracture were tried to be identified. At parameters 20 mA and 25 mA, 7075 alloys weld joints were brittlely broken. It was observed that the amount of Cu element increased at a high rate in the fracture zones of 7075 alloys (25 mA), it was clumped and active in fracture. Furthermore, it is estimated that a new formation is observed in the FZ of the welded joint made at 20 mA current in this study. As a result of the literature review, it is predicted that a natural structure similar to the one found in our study was not encountered for 7075 alloys or other welded Al-alloys. This formation was named, and the theory was put forward about the formation. The size, shape, chemistry and how this new formation came about were analysed. |
| first_indexed | 2024-04-13T23:50:45Z |
| format | Article |
| id | doaj.art-5e7b3996623f4965ba0b099896383b65 |
| institution | Directory Open Access Journal |
| issn | 2215-0986 |
| language | English |
| last_indexed | 2024-04-13T23:50:45Z |
| publishDate | 2022-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Engineering Science and Technology, an International Journal |
| spelling | doaj.art-5e7b3996623f4965ba0b099896383b652022-12-22T02:24:05ZengElsevierEngineering Science and Technology, an International Journal2215-09862022-10-0134101093Electron beam welding of 7075 aluminum alloy: Microstructure and fracture propertiesFatih Hayat0Metallurgy and Materials Engineering Department, Engineering Faculty, Karabuk University, Karabuk 78050, TurkeyAluminum alloys have widespread use due to their superior properties. However, it exhibits complex effects with its various intermetallic compounds formed by clustering of other elements in its welded joints. In this study, electron beam welding (EBW) of the 7075 aluminum alloys (Al-alloys) was examined. Two different welding current values are used in the welding process (20 and 25 mA). The welded specimens were subjected to tensile testing to determine their mechanical properties. In addition, the fractured surfaces were examined. The microhardness, scanning electron microscopy (SEM) and energy-dispersive spectroscopy analysis (EDS), EDS line analysis and EDS mapping were conducted. The microstructural evolution of EB welded plates investigated in the base metal (BM), heat affected zone (HAZ), and fusion zone (FZ), using SEM. Results indicated that after EBW, microhardness increment was observed in the FZ as compared to the BM and HAZ. The lowest hardness was observed in HAZ. The intermetallic formations in the FZ, and the effects of the elements on fracture were tried to be identified. At parameters 20 mA and 25 mA, 7075 alloys weld joints were brittlely broken. It was observed that the amount of Cu element increased at a high rate in the fracture zones of 7075 alloys (25 mA), it was clumped and active in fracture. Furthermore, it is estimated that a new formation is observed in the FZ of the welded joint made at 20 mA current in this study. As a result of the literature review, it is predicted that a natural structure similar to the one found in our study was not encountered for 7075 alloys or other welded Al-alloys. This formation was named, and the theory was put forward about the formation. The size, shape, chemistry and how this new formation came about were analysed.http://www.sciencedirect.com/science/article/pii/S2215098622000015AluminumElectron beam welding (EBW)IntermetallicScanning electron microscopy (SEM)EDS mapping |
| spellingShingle | Fatih Hayat Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties Engineering Science and Technology, an International Journal Aluminum Electron beam welding (EBW) Intermetallic Scanning electron microscopy (SEM) EDS mapping |
| title | Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties |
| title_full | Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties |
| title_fullStr | Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties |
| title_full_unstemmed | Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties |
| title_short | Electron beam welding of 7075 aluminum alloy: Microstructure and fracture properties |
| title_sort | electron beam welding of 7075 aluminum alloy microstructure and fracture properties |
| topic | Aluminum Electron beam welding (EBW) Intermetallic Scanning electron microscopy (SEM) EDS mapping |
| url | http://www.sciencedirect.com/science/article/pii/S2215098622000015 |
| work_keys_str_mv | AT fatihhayat electronbeamweldingof7075aluminumalloymicrostructureandfractureproperties |