Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization
In this study, high toughness and superplastic deformability were achieved in Mg-9Li alloys through dual-phase microstructure optimization. Solid solution (SS) and equal channel angular pressing (ECAP) treatments were employed to refine the alloy’s microstructure. The effects of these treatments on...
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MDPI AG
2025-05-01
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| Online Access: | https://www.mdpi.com/2075-4701/15/5/533 |
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| author | Jiahao Xu Xinyue Gong Wanxiang Zhao Chao Sun Guibin Shan Huan Liu Dan Song |
| author_facet | Jiahao Xu Xinyue Gong Wanxiang Zhao Chao Sun Guibin Shan Huan Liu Dan Song |
| author_sort | Jiahao Xu |
| collection | DOAJ |
| description | In this study, high toughness and superplastic deformability were achieved in Mg-9Li alloys through dual-phase microstructure optimization. Solid solution (SS) and equal channel angular pressing (ECAP) treatments were employed to refine the alloy’s microstructure. The effects of these treatments on room-temperature and low-temperature high-strain-rate superplasticity were systematically investigated under varying microstructural conditions. Results demonstrate that the SS-ECAP alloy exhibits outstanding superplasticity at room temperature and remarkable high-strain-rate deformation capability, achieving a maximum fracture elongation of 602.1%. Grain refinement and reduced dislocation density promote uniform void nucleation under high strain. Calculations of the strain rate sensitivity index (m-value) and activation energy (Q) reveal that the superplastic behavior in the SS-ECAP state is predominantly governed by grain boundary sliding facilitated by grain boundary diffusion. These findings provide critical insights into advancing the superplastic forming technology of Mg-9Li alloys. |
| format | Article |
| id | doaj-art-d2298f709ffa44bc82839ad467e7f3f3 |
| institution | DOAJ |
| issn | 2075-4701 |
| language | English |
| publishDate | 2025-05-01 |
| publisher | MDPI AG |
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| series | Metals |
| spelling | doaj-art-d2298f709ffa44bc82839ad467e7f3f32025-08-20T03:14:32ZengMDPI AGMetals2075-47012025-05-0115553310.3390/met15050533Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure OptimizationJiahao Xu0Xinyue Gong1Wanxiang Zhao2Chao Sun3Guibin Shan4Huan Liu5Dan Song6School of Materials Science and Engineering, Hohai University, Changzhou 213200, ChinaSchool of Materials Science and Engineering, Hohai University, Changzhou 213200, ChinaScientific Research Center, Suzhou Nuclear Power Research Institute, Suzhou 215004, ChinaCollege of Materials Science and Engineering, Southeast University, Nanjing 214135, ChinaSchool of Materials Science and Engineering, Hohai University, Changzhou 213200, ChinaSchool of Materials Science and Engineering, Hohai University, Changzhou 213200, ChinaSchool of Materials Science and Engineering, Hohai University, Changzhou 213200, ChinaIn this study, high toughness and superplastic deformability were achieved in Mg-9Li alloys through dual-phase microstructure optimization. Solid solution (SS) and equal channel angular pressing (ECAP) treatments were employed to refine the alloy’s microstructure. The effects of these treatments on room-temperature and low-temperature high-strain-rate superplasticity were systematically investigated under varying microstructural conditions. Results demonstrate that the SS-ECAP alloy exhibits outstanding superplasticity at room temperature and remarkable high-strain-rate deformation capability, achieving a maximum fracture elongation of 602.1%. Grain refinement and reduced dislocation density promote uniform void nucleation under high strain. Calculations of the strain rate sensitivity index (m-value) and activation energy (Q) reveal that the superplastic behavior in the SS-ECAP state is predominantly governed by grain boundary sliding facilitated by grain boundary diffusion. These findings provide critical insights into advancing the superplastic forming technology of Mg-9Li alloys.https://www.mdpi.com/2075-4701/15/5/533Mg-Li alloyequal channel angular pressingmicrostructuresuperplasticitydeformation mechanism |
| spellingShingle | Jiahao Xu Xinyue Gong Wanxiang Zhao Chao Sun Guibin Shan Huan Liu Dan Song Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization Metals Mg-Li alloy equal channel angular pressing microstructure superplasticity deformation mechanism |
| title | Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization |
| title_full | Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization |
| title_fullStr | Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization |
| title_full_unstemmed | Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization |
| title_short | Achieving Superplasticity in Ultrafine-Grained Mg-9Li Alloy via Dual-Phase Microstructure Optimization |
| title_sort | achieving superplasticity in ultrafine grained mg 9li alloy via dual phase microstructure optimization |
| topic | Mg-Li alloy equal channel angular pressing microstructure superplasticity deformation mechanism |
| url | https://www.mdpi.com/2075-4701/15/5/533 |
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