The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate
Through hot tensile testing, the flow stress-strain curves of Mg-9Gd-4Y–2Zn-0.5Zr alloy after repetitive upsetting-extrusion (RUE) have been obtained. Under high-temperature and low-strain-rate conditions (450°C-0.0001s⁻1, 500°C-0.001s⁻1, and 500°C-0.0001s⁻1), the alloy exhibits excellent plasticity...
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Elsevier
2025-01-01
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| author | Mu Meng Xiaoying Wang Jinbiao Zhang Xingxing Chen Genxing Lei Zhaoming Yan Zhimin Zhang |
| author_facet | Mu Meng Xiaoying Wang Jinbiao Zhang Xingxing Chen Genxing Lei Zhaoming Yan Zhimin Zhang |
| author_sort | Mu Meng |
| collection | DOAJ |
| description | Through hot tensile testing, the flow stress-strain curves of Mg-9Gd-4Y–2Zn-0.5Zr alloy after repetitive upsetting-extrusion (RUE) have been obtained. Under high-temperature and low-strain-rate conditions (450°C-0.0001s⁻1, 500°C-0.001s⁻1, and 500°C-0.0001s⁻1), the alloy exhibits excellent plasticity with elongation exceeding 300%, and stress progressively increases with strain in later deformation stages. The above phenomenon differs from the conventional flow behavior of magnesium alloys. The excellent plasticity is attributed to the coexistence of grain boundary sliding (GBS) and dislocation slip. Dislocation slip modes include basal <a> slip, prismatic <a> slip, and pyramidal <c+a> slip, with basal <a> and pyramidal <c+a> slips alternating continuously to ensure the continual presence of multiple slips during deformation. GBS induced by dynamic recrystallization (DRX) is considered to belong to the core-mantle mechanism. Additionally, microcracks near large block-shaped long-period stacking ordered (LPSO) phases have been observed. As strain increases, these LPSO phases dissolve gradually, reducing their size and fraction, further enhancing plasticity. The increased flow stress in later stages is determined by deformed grains that undergo dislocation slip. The resistance to dislocation movement in deformed grains is increased by dislocation strengthening and solid solution strengthening. Simultaneously, the fraction of these deformed grains continuously increases due to grain growth during hot deformation. |
| format | Article |
| id | doaj-art-98d61d56ce354c968cf01ef2e2b62026 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Journal of Materials Research and Technology |
| spelling | doaj-art-98d61d56ce354c968cf01ef2e2b620262025-01-19T06:25:06ZengElsevierJournal of Materials Research and Technology2238-78542025-01-0134259272The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rateMu Meng0Xiaoying Wang1Jinbiao Zhang2Xingxing Chen3Genxing Lei4Zhaoming Yan5Zhimin Zhang6College of Materials Science and Engineering, North University of China, Taiyuan, 030051, ChinaCollege of Materials Science and Engineering, North University of China, Taiyuan, 030051, ChinaTianshui Electric Drive Research Institute Group Co. Ltd, Tianshui, 741020, ChinaCollege of Materials Science and Engineering, North University of China, Taiyuan, 030051, ChinaCollege of Materials Science and Engineering, North University of China, Taiyuan, 030051, China; Jinxi Industrial Group Co. Ltd, Taiyuan, 030027, ChinaCollege of Materials Science and Engineering, North University of China, Taiyuan, 030051, ChinaCollege of Materials Science and Engineering, North University of China, Taiyuan, 030051, China; Corresponding author.Through hot tensile testing, the flow stress-strain curves of Mg-9Gd-4Y–2Zn-0.5Zr alloy after repetitive upsetting-extrusion (RUE) have been obtained. Under high-temperature and low-strain-rate conditions (450°C-0.0001s⁻1, 500°C-0.001s⁻1, and 500°C-0.0001s⁻1), the alloy exhibits excellent plasticity with elongation exceeding 300%, and stress progressively increases with strain in later deformation stages. The above phenomenon differs from the conventional flow behavior of magnesium alloys. The excellent plasticity is attributed to the coexistence of grain boundary sliding (GBS) and dislocation slip. Dislocation slip modes include basal <a> slip, prismatic <a> slip, and pyramidal <c+a> slip, with basal <a> and pyramidal <c+a> slips alternating continuously to ensure the continual presence of multiple slips during deformation. GBS induced by dynamic recrystallization (DRX) is considered to belong to the core-mantle mechanism. Additionally, microcracks near large block-shaped long-period stacking ordered (LPSO) phases have been observed. As strain increases, these LPSO phases dissolve gradually, reducing their size and fraction, further enhancing plasticity. The increased flow stress in later stages is determined by deformed grains that undergo dislocation slip. The resistance to dislocation movement in deformed grains is increased by dislocation strengthening and solid solution strengthening. Simultaneously, the fraction of these deformed grains continuously increases due to grain growth during hot deformation.http://www.sciencedirect.com/science/article/pii/S223878542402800XMg-9Gd-4Y–2Zn-0.5Zr alloyExcellent plasticityHigh flow stressDeformation mechanism |
| spellingShingle | Mu Meng Xiaoying Wang Jinbiao Zhang Xingxing Chen Genxing Lei Zhaoming Yan Zhimin Zhang The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate Journal of Materials Research and Technology Mg-9Gd-4Y–2Zn-0.5Zr alloy Excellent plasticity High flow stress Deformation mechanism |
| title | The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate |
| title_full | The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate |
| title_fullStr | The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate |
| title_full_unstemmed | The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate |
| title_short | The abnormal flow behavior of Mg-9Gd-4Y-2Zn-0.5Zr alloy during hot tensile deformation at high temperature and low strain rate |
| title_sort | abnormal flow behavior of mg 9gd 4y 2zn 0 5zr alloy during hot tensile deformation at high temperature and low strain rate |
| topic | Mg-9Gd-4Y–2Zn-0.5Zr alloy Excellent plasticity High flow stress Deformation mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S223878542402800X |
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