Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility
In this paper, aging precipitates and their high effects on mechanical properties of squeeze-cast Al–5Cu-0.6Li-0.5Mn-0.3Mg-0.15Ti alloy (a novel Al–Cu–Li–Mn alloy) were investigated to reveal strengthening & toughening mechanism. After T6 heat treatment (i.e., solution treatment at 530 °C fo...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785423012644 |
| _version_ | 1797745282266431488 |
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| author | Jianyu Li Yu Pan Shusen Wu Lu Chen Wei Guo Shilong Li Shulin Lü |
| author_facet | Jianyu Li Yu Pan Shusen Wu Lu Chen Wei Guo Shilong Li Shulin Lü |
| author_sort | Jianyu Li |
| collection | DOAJ |
| description | In this paper, aging precipitates and their high effects on mechanical properties of squeeze-cast Al–5Cu-0.6Li-0.5Mn-0.3Mg-0.15Ti alloy (a novel Al–Cu–Li–Mn alloy) were investigated to reveal strengthening & toughening mechanism. After T6 heat treatment (i.e., solution treatment at 530 °C for 10 h + aging at 180 °C for 8 h), its ultimate tensile strength (UTS), yield strength (YS) and elongation (El.) are 465 MPa, 310 MPa and 16.5%, respectively. Compared with the as-cast Al–Cu–Li–Mn alloy, the UTS and YS are increased by 55% and 63.2%, respectively, with almost no loss in ductility. Interestingly, the product of UTS and El. (i.e., UTS•El.) of the T6-treated Al–Cu–Li–Mn alloy reaches 7.67 GPa%, which is 50.4% higher than that of the as-cast Al–Cu–Li–Mn alloy and better than that of most third-generation or fourth-generation Al–Li and Li-free 2xxx alloys prepared by casting or plastic deformation followed by heat treatment. The uniformly dispersed submicron-sized T (AlxMnyCuz), nano-sized T1 (Al2CuLi) and much smaller θ' (Al2Cu) phases precipitated in the T6-treated Al–Cu–Li–Mn alloy are coherent or semi-coherent with aluminum matrix, which not only enhances strength but also delays strain localization and fracture. In addition, the actual average thickness of T1 and θ′ precipitates are about 2 nm and 3.5 nm, which are much larger than their critical values for the conversion of their strengthening mechanisms. Therefore, the main strengthening mechanism of the squeeze-cast Al–Cu–Li–Mn alloy is the Orowan bypassing mechanism rather than the shearing mechanism. |
| first_indexed | 2024-03-12T15:21:10Z |
| format | Article |
| id | doaj.art-bc525c98ee71450e97bd51998ae84da4 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-03-12T15:21:10Z |
| publishDate | 2023-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-bc525c98ee71450e97bd51998ae84da42023-08-11T05:33:15ZengElsevierJournal of Materials Research and Technology2238-78542023-07-012513341343Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductilityJianyu Li0Yu Pan1Shusen Wu2Lu Chen3Wei Guo4Shilong Li5Shulin Lü6State Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaState Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaState Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaState Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaState Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaState Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaCorresponding author.; State Key Lab of Materials Processing and Die & Mould Technology, School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, PR ChinaIn this paper, aging precipitates and their high effects on mechanical properties of squeeze-cast Al–5Cu-0.6Li-0.5Mn-0.3Mg-0.15Ti alloy (a novel Al–Cu–Li–Mn alloy) were investigated to reveal strengthening & toughening mechanism. After T6 heat treatment (i.e., solution treatment at 530 °C for 10 h + aging at 180 °C for 8 h), its ultimate tensile strength (UTS), yield strength (YS) and elongation (El.) are 465 MPa, 310 MPa and 16.5%, respectively. Compared with the as-cast Al–Cu–Li–Mn alloy, the UTS and YS are increased by 55% and 63.2%, respectively, with almost no loss in ductility. Interestingly, the product of UTS and El. (i.e., UTS•El.) of the T6-treated Al–Cu–Li–Mn alloy reaches 7.67 GPa%, which is 50.4% higher than that of the as-cast Al–Cu–Li–Mn alloy and better than that of most third-generation or fourth-generation Al–Li and Li-free 2xxx alloys prepared by casting or plastic deformation followed by heat treatment. The uniformly dispersed submicron-sized T (AlxMnyCuz), nano-sized T1 (Al2CuLi) and much smaller θ' (Al2Cu) phases precipitated in the T6-treated Al–Cu–Li–Mn alloy are coherent or semi-coherent with aluminum matrix, which not only enhances strength but also delays strain localization and fracture. In addition, the actual average thickness of T1 and θ′ precipitates are about 2 nm and 3.5 nm, which are much larger than their critical values for the conversion of their strengthening mechanisms. Therefore, the main strengthening mechanism of the squeeze-cast Al–Cu–Li–Mn alloy is the Orowan bypassing mechanism rather than the shearing mechanism.http://www.sciencedirect.com/science/article/pii/S2238785423012644Al–Cu–Li–Mn alloyHeat treatmentMicrostructure evolutionHigh strength and ductilitySqueeze casting |
| spellingShingle | Jianyu Li Yu Pan Shusen Wu Lu Chen Wei Guo Shilong Li Shulin Lü Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility Journal of Materials Research and Technology Al–Cu–Li–Mn alloy Heat treatment Microstructure evolution High strength and ductility Squeeze casting |
| title | Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility |
| title_full | Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility |
| title_fullStr | Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility |
| title_full_unstemmed | Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility |
| title_short | Precipitates strengthening mechanism of a new squeeze-cast Al–Cu–Li–Mn alloy with high strength and ductility |
| title_sort | precipitates strengthening mechanism of a new squeeze cast al cu li mn alloy with high strength and ductility |
| topic | Al–Cu–Li–Mn alloy Heat treatment Microstructure evolution High strength and ductility Squeeze casting |
| url | http://www.sciencedirect.com/science/article/pii/S2238785423012644 |
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