Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals
In this paper, 5083 aluminum alloy and T2 copper were selected for the friction stir lap welding test. The effect of intermetallic compounds on the microstructure and properties of Al/Cu dissimilar metal lap joints was studied. The results showed that the circulating Al/Cu composite structure was fo...
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MDPI AG
2023-12-01
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| Online Access: | https://www.mdpi.com/2075-4701/13/12/1969 |
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| author | Fan Jiang Wenquan Wang Xinge Zhang Wenbiao Gong |
| author_facet | Fan Jiang Wenquan Wang Xinge Zhang Wenbiao Gong |
| author_sort | Fan Jiang |
| collection | DOAJ |
| description | In this paper, 5083 aluminum alloy and T2 copper were selected for the friction stir lap welding test. The effect of intermetallic compounds on the microstructure and properties of Al/Cu dissimilar metal lap joints was studied. The results showed that the circulating Al/Cu composite structure was formed on the advancing side of the lap joint, and the Al/Cu staggered hook-like structure and copper-rich region were generated on the retreating side. There was no typical ‘onion ring’ structure in the joint. Element diffusion occurred at the interface of the joint, forming a thin and uniform interfacial layer of Al/Cu intermetallic compounds, thus achieving a well-metallurgical bond at the Al/Cu interface. There were the intermetallic compounds Al<sub>2</sub>Cu and Al<sub>4</sub>Cu<sub>9</sub>, without AlCu, in the lap joint. In addition, dynamic recrystallization occurred in the nugget zone, and higher dislocation density and dislocation entanglement were generated, which enhanced the deformation resistance in the nugget zone and increased the joint strength. The tensile test showed that the ductile–brittle mixed fracture occurred in the heat-affected zone on the advancing side of the aluminum plate, and the fracture had necking. The failure load of the lap joint was 4350 ± 30 N, about 80% of the aluminum base metal. The elongation of the Al/Cu dissimilar lap joint tensile specimen was 2.5%. |
| first_indexed | 2024-03-08T20:32:35Z |
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| id | doaj.art-1a0c4d196e214d42a66b3adc1bf96bec |
| institution | Directory Open Access Journal |
| issn | 2075-4701 |
| language | English |
| last_indexed | 2024-03-08T20:32:35Z |
| publishDate | 2023-12-01 |
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| spelling | doaj.art-1a0c4d196e214d42a66b3adc1bf96bec2023-12-22T14:24:42ZengMDPI AGMetals2075-47012023-12-011312196910.3390/met13121969Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar MetalsFan Jiang0Wenquan Wang1Xinge Zhang2Wenbiao Gong3Key Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, ChinaKey Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, ChinaKey Laboratory of Automobile Materials of Ministry of Education, School of Materials Science and Engineering, Jilin University, Changchun 130025, ChinaKey Laboratory of Advanced Structural Materials, Ministry of Education, Changchun University of Technology, Changchun 130012, ChinaIn this paper, 5083 aluminum alloy and T2 copper were selected for the friction stir lap welding test. The effect of intermetallic compounds on the microstructure and properties of Al/Cu dissimilar metal lap joints was studied. The results showed that the circulating Al/Cu composite structure was formed on the advancing side of the lap joint, and the Al/Cu staggered hook-like structure and copper-rich region were generated on the retreating side. There was no typical ‘onion ring’ structure in the joint. Element diffusion occurred at the interface of the joint, forming a thin and uniform interfacial layer of Al/Cu intermetallic compounds, thus achieving a well-metallurgical bond at the Al/Cu interface. There were the intermetallic compounds Al<sub>2</sub>Cu and Al<sub>4</sub>Cu<sub>9</sub>, without AlCu, in the lap joint. In addition, dynamic recrystallization occurred in the nugget zone, and higher dislocation density and dislocation entanglement were generated, which enhanced the deformation resistance in the nugget zone and increased the joint strength. The tensile test showed that the ductile–brittle mixed fracture occurred in the heat-affected zone on the advancing side of the aluminum plate, and the fracture had necking. The failure load of the lap joint was 4350 ± 30 N, about 80% of the aluminum base metal. The elongation of the Al/Cu dissimilar lap joint tensile specimen was 2.5%.https://www.mdpi.com/2075-4701/13/12/19695083 aluminum alloyT2 copperfriction stir lap weldingaluminum–copper composite structureintermetallic compounds |
| spellingShingle | Fan Jiang Wenquan Wang Xinge Zhang Wenbiao Gong Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals Metals 5083 aluminum alloy T2 copper friction stir lap welding aluminum–copper composite structure intermetallic compounds |
| title | Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals |
| title_full | Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals |
| title_fullStr | Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals |
| title_full_unstemmed | Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals |
| title_short | Microstructure and Mechanical Properties of Friction Stir Lap Welding Joint of Al/CU Dissimilar Metals |
| title_sort | microstructure and mechanical properties of friction stir lap welding joint of al cu dissimilar metals |
| topic | 5083 aluminum alloy T2 copper friction stir lap welding aluminum–copper composite structure intermetallic compounds |
| url | https://www.mdpi.com/2075-4701/13/12/1969 |
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