Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy
Various Mg–2Zn–2Gd (wt.%) alloys were hot rolled at 400 °C–500 °C to study the dynamic precipitation behavior and mechanical response in this work. The results show that hot deformation refines grain size significantly from ∼100 μm in the as-cast alloy to 5.70 μm after rolling, accompanied by the fo...
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2025-05-01
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| Series: | Journal of Materials Research and Technology |
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| author | Xuezheng Zhang Heng Qian Tijun Chen Dan Tang |
| author_facet | Xuezheng Zhang Heng Qian Tijun Chen Dan Tang |
| author_sort | Xuezheng Zhang |
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| description | Various Mg–2Zn–2Gd (wt.%) alloys were hot rolled at 400 °C–500 °C to study the dynamic precipitation behavior and mechanical response in this work. The results show that hot deformation refines grain size significantly from ∼100 μm in the as-cast alloy to 5.70 μm after rolling, accompanied by the formation of dynamically precipitated sub-micro GdZn second-phase (SP) particles that are rarely reported in Mg–Zn–Gd alloys. The fraction of SP particles varies temperature-dependently due to the crystal defect assisted nucleation and growth. As the Mg alloy is rolled at 450 °C (R450), plentiful sub-micro SP particles appear owing to the balance of solute diffusion and crystal defect density, along with a high fraction of low angle grain boundaries (78.4 %). Hot deformation enhances the strength-ductility synergy and the best comprehensive properties with ultimate tensile strength of 302 MPa, yield strength of 236 MPa and elongation to failure of 15.2 % are achieved for R450, representing enhancements of 141.6 %, 198.7 % and 334.3 % respectively as compared to as-cast alloy. The basal slip propagates through the low angle grain boundaries to improve the deformation coordination between grains, and the work hardening is improved through quadruple interactions between SP particles, dislocations, twins and low angle grain boundaries, accounting for the toughening of R450. |
| format | Article |
| id | doaj-art-5e35ff34dea149d6a7b0b53938321381 |
| institution | Kabale University |
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| language | English |
| publishDate | 2025-05-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-5e35ff34dea149d6a7b0b539383213812025-08-20T03:49:03ZengElsevierJournal of Materials Research and Technology2238-78542025-05-01367485749410.1016/j.jmrt.2025.05.039Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloyXuezheng Zhang0Heng Qian1Tijun Chen2Dan Tang3State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; Corresponding author. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, ChinaState Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; Corresponding author. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China.School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, 730050, Gansu, China; Dongguan Eontec Co. Ltd., Dongguan, 523662, Guangdong, ChinaVarious Mg–2Zn–2Gd (wt.%) alloys were hot rolled at 400 °C–500 °C to study the dynamic precipitation behavior and mechanical response in this work. The results show that hot deformation refines grain size significantly from ∼100 μm in the as-cast alloy to 5.70 μm after rolling, accompanied by the formation of dynamically precipitated sub-micro GdZn second-phase (SP) particles that are rarely reported in Mg–Zn–Gd alloys. The fraction of SP particles varies temperature-dependently due to the crystal defect assisted nucleation and growth. As the Mg alloy is rolled at 450 °C (R450), plentiful sub-micro SP particles appear owing to the balance of solute diffusion and crystal defect density, along with a high fraction of low angle grain boundaries (78.4 %). Hot deformation enhances the strength-ductility synergy and the best comprehensive properties with ultimate tensile strength of 302 MPa, yield strength of 236 MPa and elongation to failure of 15.2 % are achieved for R450, representing enhancements of 141.6 %, 198.7 % and 334.3 % respectively as compared to as-cast alloy. The basal slip propagates through the low angle grain boundaries to improve the deformation coordination between grains, and the work hardening is improved through quadruple interactions between SP particles, dislocations, twins and low angle grain boundaries, accounting for the toughening of R450.http://www.sciencedirect.com/science/article/pii/S2238785425011937Magnesium alloyDynamic precipitationSecond-phaseStrengthDuctility |
| spellingShingle | Xuezheng Zhang Heng Qian Tijun Chen Dan Tang Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy Journal of Materials Research and Technology Magnesium alloy Dynamic precipitation Second-phase Strength Ductility |
| title | Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy |
| title_full | Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy |
| title_fullStr | Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy |
| title_full_unstemmed | Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy |
| title_short | Dynamic precipitation behavior and mechanical properties of a hot rolled Mg–Zn–Gd alloy |
| title_sort | dynamic precipitation behavior and mechanical properties of a hot rolled mg zn gd alloy |
| topic | Magnesium alloy Dynamic precipitation Second-phase Strength Ductility |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425011937 |
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