Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios
In this work, the effects of Sc addition and variations in the Cu/Li ratio on the microstructure, precipitation behavior, laser welding performance, and mechanical properties of Al-Cu-Li alloys were systematically investigated. The results show that the addition of Sc refines as-cast grains, transfo...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-08-01
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| Series: | Materials & Design |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S0264127525007051 |
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| author | Changlin Li Xiwu Li Yongan Zhang Kai Wen Lizhen Yan Ying Li Yanan Li Mingyang Yu Guanjun Gao Hongwei Yan Zhihui Li Baiqing Xiong |
| author_facet | Changlin Li Xiwu Li Yongan Zhang Kai Wen Lizhen Yan Ying Li Yanan Li Mingyang Yu Guanjun Gao Hongwei Yan Zhihui Li Baiqing Xiong |
| author_sort | Changlin Li |
| collection | DOAJ |
| description | In this work, the effects of Sc addition and variations in the Cu/Li ratio on the microstructure, precipitation behavior, laser welding performance, and mechanical properties of Al-Cu-Li alloys were systematically investigated. The results show that the addition of Sc refines as-cast grains, transforming coarse columnar grains into fine equiaxed grains. In high Cu/Li ratio alloys, the addition of Sc leads to the formation of the W (AlCuSc) phase. Reducing the Cu/Li ratio alters the solidification sequence, favoring early precipitation of the Al2CuLi phase and inhibiting W phase formation. The addition of the Sc significantly increases the elongation, while the introduced W phase does not cause a significant decrease in the strength of the T8-aged alloy. A lower Cu/Li ratio reduces the T1 phase volume fraction, but the high density of δ′/GPI/δ′ composite phases compensates for the strength loss from T1 phase. The addition of the Sc element significantly refines the grain size of the welded joints and suppresses solidification and liquation cracks. Simultaneously, a large number of Al3(Sc, Zr) particles precipitate in the HAZ, enhancing the strength of the joints and reducing softening in this zone. The medium Cu/Li ratio alloy exhibits excellent overall mechanical properties and welding performance. |
| format | Article |
| id | doaj-art-4254b8fd1f02433097137c31abaec8fb |
| institution | Kabale University |
| issn | 0264-1275 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Materials & Design |
| spelling | doaj-art-4254b8fd1f02433097137c31abaec8fb2025-08-20T03:47:19ZengElsevierMaterials & Design0264-12752025-08-0125611428510.1016/j.matdes.2025.114285Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratiosChanglin Li0Xiwu Li1Yongan Zhang2Kai Wen3Lizhen Yan4Ying Li5Yanan Li6Mingyang Yu7Guanjun Gao8Hongwei Yan9Zhihui Li10Baiqing Xiong11State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, China; Corresponding authors at: State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China.State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, China; Corresponding authors at: State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China.State Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; GRIMAT Engineering Institute Co., LTD., Beijing 101407, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaState Key Laboratory of Nonferrous Structural Materials, China GRINM Group Co., LTD., Beijing 100088, China; General Research Institute for Nonferrous Metals, Beijing 100088, ChinaIn this work, the effects of Sc addition and variations in the Cu/Li ratio on the microstructure, precipitation behavior, laser welding performance, and mechanical properties of Al-Cu-Li alloys were systematically investigated. The results show that the addition of Sc refines as-cast grains, transforming coarse columnar grains into fine equiaxed grains. In high Cu/Li ratio alloys, the addition of Sc leads to the formation of the W (AlCuSc) phase. Reducing the Cu/Li ratio alters the solidification sequence, favoring early precipitation of the Al2CuLi phase and inhibiting W phase formation. The addition of the Sc significantly increases the elongation, while the introduced W phase does not cause a significant decrease in the strength of the T8-aged alloy. A lower Cu/Li ratio reduces the T1 phase volume fraction, but the high density of δ′/GPI/δ′ composite phases compensates for the strength loss from T1 phase. The addition of the Sc element significantly refines the grain size of the welded joints and suppresses solidification and liquation cracks. Simultaneously, a large number of Al3(Sc, Zr) particles precipitate in the HAZ, enhancing the strength of the joints and reducing softening in this zone. The medium Cu/Li ratio alloy exhibits excellent overall mechanical properties and welding performance.http://www.sciencedirect.com/science/article/pii/S0264127525007051Al-Cu-Li alloySc elementMicrostructureMechanical propertyLaser welding performance |
| spellingShingle | Changlin Li Xiwu Li Yongan Zhang Kai Wen Lizhen Yan Ying Li Yanan Li Mingyang Yu Guanjun Gao Hongwei Yan Zhihui Li Baiqing Xiong Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios Materials & Design Al-Cu-Li alloy Sc element Microstructure Mechanical property Laser welding performance |
| title | Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios |
| title_full | Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios |
| title_fullStr | Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios |
| title_full_unstemmed | Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios |
| title_short | Achieving high strength and good laser welding performance by adding Sc to T8-aged Al-Cu-Li alloys with different Cu/Li ratios |
| title_sort | achieving high strength and good laser welding performance by adding sc to t8 aged al cu li alloys with different cu li ratios |
| topic | Al-Cu-Li alloy Sc element Microstructure Mechanical property Laser welding performance |
| url | http://www.sciencedirect.com/science/article/pii/S0264127525007051 |
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