Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy
Rare earth metals are commonly added into Mg–Li alloys for strength or ductility improvement. In this paper, rare earth element Ce was incorporated into a Mg–Li alloy to modify its mechanical properties. It is found that the addition of small amount Ce (0.6 wt%) improves over 13% tensile strengths o...
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Elsevier
2025-01-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424030096 |
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| author | Zhonghao Heng Lijuan Huang Qianwen Zhang Xianzhe Shi Jianghua Shen |
| author_facet | Zhonghao Heng Lijuan Huang Qianwen Zhang Xianzhe Shi Jianghua Shen |
| author_sort | Zhonghao Heng |
| collection | DOAJ |
| description | Rare earth metals are commonly added into Mg–Li alloys for strength or ductility improvement. In this paper, rare earth element Ce was incorporated into a Mg–Li alloy to modify its mechanical properties. It is found that the addition of small amount Ce (0.6 wt%) improves over 13% tensile strengths of the Mg–Li alloy without expense of ductility, owing to the formation of Mg12Ce precipitates. To illustrate the toughening mechanism, an in-situ tensile experiment was performed focusing on crack initiation and fracture behavior at local regions such as phase boundaries. It is found that the deformation incompatibility occurs between the α-Mg and β-Li phases in Mg–9Li, and local strain analysis suggested that the β-Li phase contributes more than the α-Mg phase to the plasticity. However, the incorporation of Ce enhances the deformability of the α-Mg phase by weakening its basal texture, which alleviates the strain incompatibility along the phase boundaries. That is why the strength-ductility dilemma is overcome in the Ce-doped Mg–Li alloy. Besides, microcracks mostly generate within fine strips of α-Mg phase for the Ce-free alloy, while for the Ce-doped alloy both the fine α-Mg phase and precipitate strips serve as crack initiators. |
| format | Article |
| id | doaj-art-4d4ce8146b764be0acb51381f135f4f8 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-4d4ce8146b764be0acb51381f135f4f82025-01-19T06:25:49ZengElsevierJournal of Materials Research and Technology2238-78542025-01-013425012511Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloyZhonghao Heng0Lijuan Huang1Qianwen Zhang2Xianzhe Shi3Jianghua Shen4School of Mechanical Engineering, Qinghai University, Xining, Qinghai, China; School of Aeronautics, Northwestern Polytechnical University, Xi'an, ChinaSchool of Mechanical Engineering, Qinghai University, Xining, Qinghai, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi'an, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi'an, ChinaSchool of Aeronautics, Northwestern Polytechnical University, Xi'an, China; Shaanxi Key Laboratory of Impact Dynamic and Its Engineering Application, Northwestern Polytechnical University, Xi'an, Shaanxi, China; Corresponding author. School of Aeronautics, Northwestern Polytechnical University, Xi'an, China.Rare earth metals are commonly added into Mg–Li alloys for strength or ductility improvement. In this paper, rare earth element Ce was incorporated into a Mg–Li alloy to modify its mechanical properties. It is found that the addition of small amount Ce (0.6 wt%) improves over 13% tensile strengths of the Mg–Li alloy without expense of ductility, owing to the formation of Mg12Ce precipitates. To illustrate the toughening mechanism, an in-situ tensile experiment was performed focusing on crack initiation and fracture behavior at local regions such as phase boundaries. It is found that the deformation incompatibility occurs between the α-Mg and β-Li phases in Mg–9Li, and local strain analysis suggested that the β-Li phase contributes more than the α-Mg phase to the plasticity. However, the incorporation of Ce enhances the deformability of the α-Mg phase by weakening its basal texture, which alleviates the strain incompatibility along the phase boundaries. That is why the strength-ductility dilemma is overcome in the Ce-doped Mg–Li alloy. Besides, microcracks mostly generate within fine strips of α-Mg phase for the Ce-free alloy, while for the Ce-doped alloy both the fine α-Mg phase and precipitate strips serve as crack initiators.http://www.sciencedirect.com/science/article/pii/S2238785424030096Mg-Li alloyMechanical propertiesIn-situStrain incompatibilityCrack growth |
| spellingShingle | Zhonghao Heng Lijuan Huang Qianwen Zhang Xianzhe Shi Jianghua Shen Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy Journal of Materials Research and Technology Mg-Li alloy Mechanical properties In-situ Strain incompatibility Crack growth |
| title | Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy |
| title_full | Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy |
| title_fullStr | Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy |
| title_full_unstemmed | Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy |
| title_short | Simultaneously improved strength and ductility in a Ce-doped dual-phase Mg–9Li alloy |
| title_sort | simultaneously improved strength and ductility in a ce doped dual phase mg 9li alloy |
| topic | Mg-Li alloy Mechanical properties In-situ Strain incompatibility Crack growth |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424030096 |
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