Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling
In order to explore the high temperature ductility of ultra-light magnesium-lithium alloy, a new Mg-7.28Li-2.19Al-0.091Y (LAY720) alloy was prepared by casting and rolling. The microstructural evolution, mechanical properties, model, and deformation mechanism under hot tension were studied by optica...
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Elsevier
2025-01-01
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| author | Furong Cao Bijin Zhou Panning Xu Guangming Xu |
| author_facet | Furong Cao Bijin Zhou Panning Xu Guangming Xu |
| author_sort | Furong Cao |
| collection | DOAJ |
| description | In order to explore the high temperature ductility of ultra-light magnesium-lithium alloy, a new Mg-7.28Li-2.19Al-0.091Y (LAY720) alloy was prepared by casting and rolling. The microstructural evolution, mechanical properties, model, and deformation mechanism under hot tension were studied by optical microscope, X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy, and tensile tester. Mechanical properties tests showed that the maximum elongation of 265.8% was achieved at 623 K and 5.0 × 10−4 s−1 Microstructural examination found that the tensile alloy is composed of α-Mg + β–Li dual-phase banded grains under high strain rate condition, which disappears when the strain rate decreases and the temperature increases. Continuous dynamic recrystallization occurs at 473 and 523 K while dynamic grain growth occurs at 573 and 623 K under the other strain rates. The AlLi compound precipitation at the α-Mg grain boundary was discovered in LAY720 alloy at 523 K and 1.67 × 10−4 s−1. A critical strain and critical stress model for dynamic recrystallization of the alloy was obtained. Discontinuous dynamic recrystallization and dynamic grain growth were estimated by our models. A power-law constitutive analysis revealed that the stress exponent of 3 and the deformation activation energy of 138.35 kJ/mol confirmed that lattice diffusion controlled dislocation glide and dynamic grain growth are the deformation mechanism at 623 K and 5.0 × 10−4 s−1. |
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| id | doaj-art-2c384b742c0c4f2996f41579d7f07ad2 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| spelling | doaj-art-2c384b742c0c4f2996f41579d7f07ad22025-01-19T06:25:58ZengElsevierJournal of Materials Research and Technology2238-78542025-01-013426982714Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rollingFurong Cao0Bijin Zhou1Panning Xu2Guangming Xu3School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR China; State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang, 110819, PR China; Corresponding author. School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR China.School of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR China; School of Mechanical Engineering, Suzhou University of Science and Technology, Suzhou, 215009, PR ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR ChinaSchool of Materials Science and Engineering, Northeastern University, Shenyang, 110819, PR ChinaIn order to explore the high temperature ductility of ultra-light magnesium-lithium alloy, a new Mg-7.28Li-2.19Al-0.091Y (LAY720) alloy was prepared by casting and rolling. The microstructural evolution, mechanical properties, model, and deformation mechanism under hot tension were studied by optical microscope, X-ray diffraction, scanning electron microscope, energy dispersive spectroscopy, and tensile tester. Mechanical properties tests showed that the maximum elongation of 265.8% was achieved at 623 K and 5.0 × 10−4 s−1 Microstructural examination found that the tensile alloy is composed of α-Mg + β–Li dual-phase banded grains under high strain rate condition, which disappears when the strain rate decreases and the temperature increases. Continuous dynamic recrystallization occurs at 473 and 523 K while dynamic grain growth occurs at 573 and 623 K under the other strain rates. The AlLi compound precipitation at the α-Mg grain boundary was discovered in LAY720 alloy at 523 K and 1.67 × 10−4 s−1. A critical strain and critical stress model for dynamic recrystallization of the alloy was obtained. Discontinuous dynamic recrystallization and dynamic grain growth were estimated by our models. A power-law constitutive analysis revealed that the stress exponent of 3 and the deformation activation energy of 138.35 kJ/mol confirmed that lattice diffusion controlled dislocation glide and dynamic grain growth are the deformation mechanism at 623 K and 5.0 × 10−4 s−1.http://www.sciencedirect.com/science/article/pii/S2238785424030564Mg-Li-Al-Y alloyRollingSuperplasticityMicrostructureDeformation mechanism |
| spellingShingle | Furong Cao Bijin Zhou Panning Xu Guangming Xu Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling Journal of Materials Research and Technology Mg-Li-Al-Y alloy Rolling Superplasticity Microstructure Deformation mechanism |
| title | Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling |
| title_full | Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling |
| title_fullStr | Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling |
| title_full_unstemmed | Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling |
| title_short | Quasi-superplasticity in an Mg–Li–Al–Y alloy processed by rolling |
| title_sort | quasi superplasticity in an mg li al y alloy processed by rolling |
| topic | Mg-Li-Al-Y alloy Rolling Superplasticity Microstructure Deformation mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424030564 |
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