Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction
Abstract Friction stir processing (FSP) is successfully employed to alleviate their hook defects of friction stir lap welding (FSLW) of aluminum alloys. The mechanical properties and microstructural characteristics are compared and analyzed between the FSLW&FSP joint fabricated by FSLW and FSP a...
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| Language: | English |
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Nature Portfolio
2024-12-01
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| Series: | Scientific Reports |
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| Online Access: | https://doi.org/10.1038/s41598-024-83493-2 |
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| author | Kun Gao Zhenlong Zhang Guangdong Wang Xiaojun Sun Yingyue Zhang |
| author_facet | Kun Gao Zhenlong Zhang Guangdong Wang Xiaojun Sun Yingyue Zhang |
| author_sort | Kun Gao |
| collection | DOAJ |
| description | Abstract Friction stir processing (FSP) is successfully employed to alleviate their hook defects of friction stir lap welding (FSLW) of aluminum alloys. The mechanical properties and microstructural characteristics are compared and analyzed between the FSLW&FSP joint fabricated by FSLW and FSP and the FSLW joint. The microstructural analysis shows that the hook defect zone at the advancing side of the FSLW joint is changed into the overlap zone (OZ) of the FSLW&FSP joint due to microstructure reconstruction caused by performing the FSP. The heterogeneous and coarse grains at the hook defect zone of the FSLW joint are transformed into refined and equiaxed grains at the OZ of the FSLW&FSP joint as a result of dynamic recrystallization. The results of tensile tests show that tensile strength and fracture toughness of the FSLW&FSP joint are 85.7% and 220% higher compared to those of the FSLW joint, respectively. The cross sections of broken lap joints reveal that their failure location is shifted from the hook defect at AS of the FSLW joint to the thermo-mechanically affected zone of the FSP zone of FSLW&FSP joint. The combined action of effective sheet thickness increasement, microstructure uniformity, grain refinement, and local stress concentration reduction act as the strengthening mechanism of the lap joint of aluminum alloys. |
| format | Article |
| id | doaj-art-943b87af80d94d27a8f217a88aa146a8 |
| institution | Kabale University |
| issn | 2045-2322 |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Nature Portfolio |
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| series | Scientific Reports |
| spelling | doaj-art-943b87af80d94d27a8f217a88aa146a82025-01-05T12:25:18ZengNature PortfolioScientific Reports2045-23222024-12-0114111310.1038/s41598-024-83493-2Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstructionKun Gao0Zhenlong Zhang1Guangdong Wang2Xiaojun Sun3Yingyue Zhang4Automobile and Traffic Engineering, Liaoning University of TechnologyAutomobile and Traffic Engineering, Liaoning University of TechnologySchool of Materials Science and Engineering, Liaoning University of TechnologyAutomobile and Traffic Engineering, Liaoning University of TechnologySchool of Reliability and Systems Engineering, Beihang UniversityAbstract Friction stir processing (FSP) is successfully employed to alleviate their hook defects of friction stir lap welding (FSLW) of aluminum alloys. The mechanical properties and microstructural characteristics are compared and analyzed between the FSLW&FSP joint fabricated by FSLW and FSP and the FSLW joint. The microstructural analysis shows that the hook defect zone at the advancing side of the FSLW joint is changed into the overlap zone (OZ) of the FSLW&FSP joint due to microstructure reconstruction caused by performing the FSP. The heterogeneous and coarse grains at the hook defect zone of the FSLW joint are transformed into refined and equiaxed grains at the OZ of the FSLW&FSP joint as a result of dynamic recrystallization. The results of tensile tests show that tensile strength and fracture toughness of the FSLW&FSP joint are 85.7% and 220% higher compared to those of the FSLW joint, respectively. The cross sections of broken lap joints reveal that their failure location is shifted from the hook defect at AS of the FSLW joint to the thermo-mechanically affected zone of the FSP zone of FSLW&FSP joint. The combined action of effective sheet thickness increasement, microstructure uniformity, grain refinement, and local stress concentration reduction act as the strengthening mechanism of the lap joint of aluminum alloys.https://doi.org/10.1038/s41598-024-83493-2Friction stir lap weldingHook defectMicrostructure reconstructionStrengthening mechanism |
| spellingShingle | Kun Gao Zhenlong Zhang Guangdong Wang Xiaojun Sun Yingyue Zhang Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction Scientific Reports Friction stir lap welding Hook defect Microstructure reconstruction Strengthening mechanism |
| title | Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| title_full | Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| title_fullStr | Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| title_full_unstemmed | Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| title_short | Enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| title_sort | enhancing metallurgical and mechanical properties of friction stir lap welding of aluminum alloys by microstructure reconstruction |
| topic | Friction stir lap welding Hook defect Microstructure reconstruction Strengthening mechanism |
| url | https://doi.org/10.1038/s41598-024-83493-2 |
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