Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries
Mg-Li alloys with high lithium concentrations possess a lightweight body-centered cubic (BCC) matrix structure (β-Li). Interspersed eutectics (primarily the reticulated I-phase) often form along phase boundaries (PBs) and grain boundaries (GBs) which strengthen the alloy but cause the loss of ductil...
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KeAi Communications Co., Ltd.
2024-11-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956724000653 |
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| author | Yu Wang Ziyang Xia Jingpeng Xiong Gang Zeng Penghao Wang Lan Luo Ruizhi Wu Jian Wang Yong Liu |
| author_facet | Yu Wang Ziyang Xia Jingpeng Xiong Gang Zeng Penghao Wang Lan Luo Ruizhi Wu Jian Wang Yong Liu |
| author_sort | Yu Wang |
| collection | DOAJ |
| description | Mg-Li alloys with high lithium concentrations possess a lightweight body-centered cubic (BCC) matrix structure (β-Li). Interspersed eutectics (primarily the reticulated I-phase) often form along phase boundaries (PBs) and grain boundaries (GBs) which strengthen the alloy but cause the loss of ductility due to the brittle behavior of I-phase. By modifying the Li content, we fabricated the (β+α) biphase Mg-Li alloy in which the α-Mg phase with a hexagonal close-packed structure (HCP) is embedded in β-Li matrix, significantly increasing interface density. The high-density interfaces mitigate the distribution and dimension of the I-phase along GBs and PBs. The alloy exhibits enhanced ductility (elongation (EL) = 17.8 %) compared with the alloy without the α-Mg phase (EL = 5.1 %). Structural characterizations unveil the strengthening mechanism of the nanoscale B2 (Li, Mg)3Zn-type precipitates in conjunction with the microscale I-phase. The (Li, Mg)3Zn nanophases augment the yield and ultimate tensile strength of the alloy without a discernible compromise in ductility, predominantly due to gliding dislocations cutting through the precipitates. In contrast, the microscale I-phase presents a formidable barrier to dislocation motion, facilitating dislocation pileups at interfaces and culminating in diminished ductility across the interface. In-situ stretching techniques were employed to scrutinize the microstructural evolution of alloys during tensile deformation, elucidating that the deformation compatibility of alloys correlates with the average size of the I-phase and their distribution along GBs and PBs. Corresponding to the orientation relationship (OR) between the α-Mg and β-Li phases {110}Li//{0001}Mg and <1¯11>Li //<112¯0>Mg, the slip continuity between α-Mg and β-Li on plane pairs of {123}Li-{112¯2}Mg and {112}Li-{112¯2}Mg assures the deformation compatibility through facilitating the deformation across interfaces. Simultaneously, during the stretching process, the dispersed I-phase instigates the emergence of sporadic microcracks, indicating gradual damage evolution. These discoveries offer novel insights into achieving exceptional strength-ductility amalgamations in Mg-Li alloys through microstructural adjustments. |
| format | Article |
| id | doaj-art-6f40942644eb49dfb69e28e40445eb8c |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-6f40942644eb49dfb69e28e40445eb8c2025-01-05T04:28:03ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672024-11-01121147224739Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundariesYu Wang0Ziyang Xia1Jingpeng Xiong2Gang Zeng3Penghao Wang4Lan Luo5Ruizhi Wu6Jian Wang7Yong Liu8Key Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, ChinaKey Laboratory of Superlight Materials & Surface Technology, Ministry of Education, Harbin Engineering University, Harbin 150001, China; Corresponding authors.Mechanical and Materials Engineering, University of Nebraska-Lincoln, Lincoln, NE 68588, USA; Corresponding authors.Key Laboratory of Light weight and high strength structural materials of Jiang xi Province, Advanced Manufacturing School of Nanchang University, Nanchang 330031, China; Corresponding authors.Mg-Li alloys with high lithium concentrations possess a lightweight body-centered cubic (BCC) matrix structure (β-Li). Interspersed eutectics (primarily the reticulated I-phase) often form along phase boundaries (PBs) and grain boundaries (GBs) which strengthen the alloy but cause the loss of ductility due to the brittle behavior of I-phase. By modifying the Li content, we fabricated the (β+α) biphase Mg-Li alloy in which the α-Mg phase with a hexagonal close-packed structure (HCP) is embedded in β-Li matrix, significantly increasing interface density. The high-density interfaces mitigate the distribution and dimension of the I-phase along GBs and PBs. The alloy exhibits enhanced ductility (elongation (EL) = 17.8 %) compared with the alloy without the α-Mg phase (EL = 5.1 %). Structural characterizations unveil the strengthening mechanism of the nanoscale B2 (Li, Mg)3Zn-type precipitates in conjunction with the microscale I-phase. The (Li, Mg)3Zn nanophases augment the yield and ultimate tensile strength of the alloy without a discernible compromise in ductility, predominantly due to gliding dislocations cutting through the precipitates. In contrast, the microscale I-phase presents a formidable barrier to dislocation motion, facilitating dislocation pileups at interfaces and culminating in diminished ductility across the interface. In-situ stretching techniques were employed to scrutinize the microstructural evolution of alloys during tensile deformation, elucidating that the deformation compatibility of alloys correlates with the average size of the I-phase and their distribution along GBs and PBs. Corresponding to the orientation relationship (OR) between the α-Mg and β-Li phases {110}Li//{0001}Mg and <1¯11>Li //<112¯0>Mg, the slip continuity between α-Mg and β-Li on plane pairs of {123}Li-{112¯2}Mg and {112}Li-{112¯2}Mg assures the deformation compatibility through facilitating the deformation across interfaces. Simultaneously, during the stretching process, the dispersed I-phase instigates the emergence of sporadic microcracks, indicating gradual damage evolution. These discoveries offer novel insights into achieving exceptional strength-ductility amalgamations in Mg-Li alloys through microstructural adjustments.http://www.sciencedirect.com/science/article/pii/S2213956724000653Mg-Li alloysDeformation compatibilityDuctilityStrengthening mechanism |
| spellingShingle | Yu Wang Ziyang Xia Jingpeng Xiong Gang Zeng Penghao Wang Lan Luo Ruizhi Wu Jian Wang Yong Liu Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries Journal of Magnesium and Alloys Mg-Li alloys Deformation compatibility Ductility Strengthening mechanism |
| title | Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| title_full | Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| title_fullStr | Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| title_full_unstemmed | Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| title_short | Enhancing the ductility of cast Mg-Li alloys via dispersed α-Mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| title_sort | enhancing the ductility of cast mg li alloys via dispersed α mg phase mitigating the dimension and distribution of interspersed eutectics along grain boundaries |
| topic | Mg-Li alloys Deformation compatibility Ductility Strengthening mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2213956724000653 |
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