Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation
The Mg-8Gd-3.5Y-1.5Zn-0.8Mn (wt%) alloy was designed and prepared to investigate the synergistic dynamic recrystallization (DRX) mechanism at high temperature and low strain rate. We studied DRX process at different strain rates and temperatures, and revealed the corresponding mechanisms. The result...
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Elsevier
2025-03-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785425001607 |
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| author | Yini Lin Shiming Wu Yongxin Wang Hao Chen Guo Li Weidong Xie Guobing Wei Yan Yang Xiaodong Peng |
| author_facet | Yini Lin Shiming Wu Yongxin Wang Hao Chen Guo Li Weidong Xie Guobing Wei Yan Yang Xiaodong Peng |
| author_sort | Yini Lin |
| collection | DOAJ |
| description | The Mg-8Gd-3.5Y-1.5Zn-0.8Mn (wt%) alloy was designed and prepared to investigate the synergistic dynamic recrystallization (DRX) mechanism at high temperature and low strain rate. We studied DRX process at different strain rates and temperatures, and revealed the corresponding mechanisms. The results show that at a low strain rate of 0.01 s−1 and 723 K, the grain size significantly decreases compared to 623 K, the grain boundaries protrude outward, and new small grains are generated. Quantitative calculations indicate that the thermal deformation mechanism can be reflected by the dissipation efficiency factor η. As the value of η increases, the dynamic softening mechanism shifts from dynamic recovery (DRV) to DRX. When the value of η is greater than 0.36, under these conditions, continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) occur. This is because dislocation slip is hindered at grain boundaries, leading to dislocation entanglement and rearrangement, promoting the formation of low angle grain boundaries (LAGBs). As the deformation process progresses, the dislocation density of LAGBs continues to increase, reaching the critical point of promoting DRX. On the one hand, the high dislocation density region can serve as a nucleation site for DRX, and on the other hand, its characteristic of high strain storage energy is the driving force for CDRX nucleation. With the occurrence of CDRX, LAGBs gradually transform into high angle grain boundaries (HAGBs). CDRX provides nucleation sites for DDRX, and the outward protruding grain boundaries promote dynamic recrystallization nucleation. The distortion energy difference between the new grains and the surrounding matrix promotes the continuous movement of LAGBs, ultimately leading to the growth of crystal nuclei and the formation of recrystallized grains. The results indicate that controlling the hot working conditions can improve the microstructure of the alloy through recrystallization, thereby developing high-strength magnesium alloys. |
| format | Article |
| id | doaj-art-e2b48df335784d94ae15b014f91717f6 |
| institution | Kabale University |
| issn | 2238-7854 |
| language | English |
| publishDate | 2025-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj-art-e2b48df335784d94ae15b014f91717f62025-01-31T05:11:23ZengElsevierJournal of Materials Research and Technology2238-78542025-03-013524222433Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformationYini Lin0Shiming Wu1Yongxin Wang2Hao Chen3Guo Li4Weidong Xie5Guobing Wei6Yan Yang7Xiaodong Peng8National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, China; Corresponding author. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China.,National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, China; Corresponding author. National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China.,National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; International Joint Laboratory for Light Alloys (Ministry of Education), Chongqing University, Chongqing, 400044, ChinaThe Mg-8Gd-3.5Y-1.5Zn-0.8Mn (wt%) alloy was designed and prepared to investigate the synergistic dynamic recrystallization (DRX) mechanism at high temperature and low strain rate. We studied DRX process at different strain rates and temperatures, and revealed the corresponding mechanisms. The results show that at a low strain rate of 0.01 s−1 and 723 K, the grain size significantly decreases compared to 623 K, the grain boundaries protrude outward, and new small grains are generated. Quantitative calculations indicate that the thermal deformation mechanism can be reflected by the dissipation efficiency factor η. As the value of η increases, the dynamic softening mechanism shifts from dynamic recovery (DRV) to DRX. When the value of η is greater than 0.36, under these conditions, continuous dynamic recrystallization (CDRX) and discontinuous dynamic recrystallization (DDRX) occur. This is because dislocation slip is hindered at grain boundaries, leading to dislocation entanglement and rearrangement, promoting the formation of low angle grain boundaries (LAGBs). As the deformation process progresses, the dislocation density of LAGBs continues to increase, reaching the critical point of promoting DRX. On the one hand, the high dislocation density region can serve as a nucleation site for DRX, and on the other hand, its characteristic of high strain storage energy is the driving force for CDRX nucleation. With the occurrence of CDRX, LAGBs gradually transform into high angle grain boundaries (HAGBs). CDRX provides nucleation sites for DDRX, and the outward protruding grain boundaries promote dynamic recrystallization nucleation. The distortion energy difference between the new grains and the surrounding matrix promotes the continuous movement of LAGBs, ultimately leading to the growth of crystal nuclei and the formation of recrystallized grains. The results indicate that controlling the hot working conditions can improve the microstructure of the alloy through recrystallization, thereby developing high-strength magnesium alloys.http://www.sciencedirect.com/science/article/pii/S2238785425001607Mg alloyDRX mechanismHot deformationMicrostructure evolution |
| spellingShingle | Yini Lin Shiming Wu Yongxin Wang Hao Chen Guo Li Weidong Xie Guobing Wei Yan Yang Xiaodong Peng Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation Journal of Materials Research and Technology Mg alloy DRX mechanism Hot deformation Microstructure evolution |
| title | Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation |
| title_full | Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation |
| title_fullStr | Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation |
| title_full_unstemmed | Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation |
| title_short | Dynamic recrystallization mechanism of high-strength Mg-Gd-Y-Zn-Mn alloy by hot compression deformation |
| title_sort | dynamic recrystallization mechanism of high strength mg gd y zn mn alloy by hot compression deformation |
| topic | Mg alloy DRX mechanism Hot deformation Microstructure evolution |
| url | http://www.sciencedirect.com/science/article/pii/S2238785425001607 |
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