Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating
A porous high entropy alloy (HEA) coating was prepared on a steel surface by vacuum sintering. The coating was then used as a transition layer during dissimilar laser joining of Al to steel. Compared with the uncoated laser joints, the liquid alloy spread and infiltrated into the porous structure, t...
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| Format: | Article |
| Language: | English |
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Elsevier
2023-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423002727 |
| _version_ | 1797858774828974080 |
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| author | Min Zheng Jin Yang Jiayi Xu Jiawei Jiang Hua Zhang J.P. Oliveira Xueqi Lv Jing Xue Zhuguo Li |
| author_facet | Min Zheng Jin Yang Jiayi Xu Jiawei Jiang Hua Zhang J.P. Oliveira Xueqi Lv Jing Xue Zhuguo Li |
| author_sort | Min Zheng |
| collection | DOAJ |
| description | A porous high entropy alloy (HEA) coating was prepared on a steel surface by vacuum sintering. The coating was then used as a transition layer during dissimilar laser joining of Al to steel. Compared with the uncoated laser joints, the liquid alloy spread and infiltrated into the porous structure, the contact angle of the weld reduced from 65.8° to 56.7°, and the brazed width increased from 5.1 mm to 5.9 mm, which improved the wettability and spreadability of the molten filler wire on the substrate. In the case of the uncoated steel, the fusion zone/steel interfacial microstructure consisted of laminated Al7·2Fe1·8Si and Fe(Al,Si)3, while it changed to a composite-like structure containing a soft HEA skeleton and hard IMCs which included Al7·2Fe1·8Si, Al3Ni, and (Al,Si)2Cr. In addition, due to the sluggish diffusion effect of HEAs, a layer of gradient nanocrystalline composed of Al7·2Fe1·8Si was generated, which significantly strengthened the dissimilar laser joints with improvements in both the fracture load (∼26.5%) and the displacement (∼101.8%). The fracture mode changed from brittle to ductile failure when the porous HEA coating was applied, with fracture propagating through the HEA skeleton. This work provides a novel solution for the strengthening of hard-to-join dissimilar combinations. |
| first_indexed | 2024-04-09T21:19:53Z |
| format | Article |
| id | doaj.art-d0dd7763250c4f748093c77cd6348f2b |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-09T21:19:53Z |
| publishDate | 2023-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-d0dd7763250c4f748093c77cd6348f2b2023-03-28T06:47:47ZengElsevierJournal of Materials Research and Technology2238-78542023-03-012339974011Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coatingMin Zheng0Jin Yang1Jiayi Xu2Jiawei Jiang3Hua Zhang4J.P. Oliveira5Xueqi Lv6Jing Xue7Zhuguo Li8School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; School of Advanced Manufacturing, Nanchang University, Nanchang 330031, ChinaSchool of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, China; Corresponding author.School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Advanced Manufacturing, Nanchang University, Nanchang 330031, China; Shanghai Collaborative Innovation Center of Intelligent Manufacturing Robot Technology for Large Components, Shanghai 201620, China; Corresponding author.CENIMAT|i3N, Department of Materials Science, School of Science and Technology, NOVA University Lisbon, Caparica, PortugalSchool of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, ChinaSchool of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai 201620, ChinaShanghai Key Laboratory of Material Laser Processing and Modification, Shanghai Jiao Tong University, Shanghai 200240, PR ChinaA porous high entropy alloy (HEA) coating was prepared on a steel surface by vacuum sintering. The coating was then used as a transition layer during dissimilar laser joining of Al to steel. Compared with the uncoated laser joints, the liquid alloy spread and infiltrated into the porous structure, the contact angle of the weld reduced from 65.8° to 56.7°, and the brazed width increased from 5.1 mm to 5.9 mm, which improved the wettability and spreadability of the molten filler wire on the substrate. In the case of the uncoated steel, the fusion zone/steel interfacial microstructure consisted of laminated Al7·2Fe1·8Si and Fe(Al,Si)3, while it changed to a composite-like structure containing a soft HEA skeleton and hard IMCs which included Al7·2Fe1·8Si, Al3Ni, and (Al,Si)2Cr. In addition, due to the sluggish diffusion effect of HEAs, a layer of gradient nanocrystalline composed of Al7·2Fe1·8Si was generated, which significantly strengthened the dissimilar laser joints with improvements in both the fracture load (∼26.5%) and the displacement (∼101.8%). The fracture mode changed from brittle to ductile failure when the porous HEA coating was applied, with fracture propagating through the HEA skeleton. This work provides a novel solution for the strengthening of hard-to-join dissimilar combinations.http://www.sciencedirect.com/science/article/pii/S2238785423002727High entropy alloyPorous coatingLaser weldingInterfacial microstructureMechanical properties |
| spellingShingle | Min Zheng Jin Yang Jiayi Xu Jiawei Jiang Hua Zhang J.P. Oliveira Xueqi Lv Jing Xue Zhuguo Li Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating Journal of Materials Research and Technology High entropy alloy Porous coating Laser welding Interfacial microstructure Mechanical properties |
| title | Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating |
| title_full | Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating |
| title_fullStr | Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating |
| title_full_unstemmed | Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating |
| title_short | Interfacial microstructure and strengthening mechanism of dissimilar laser al/steel joint via a porous high entropy alloy coating |
| title_sort | interfacial microstructure and strengthening mechanism of dissimilar laser al steel joint via a porous high entropy alloy coating |
| topic | High entropy alloy Porous coating Laser welding Interfacial microstructure Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423002727 |
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