Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects
While the deformation behavior of rare-earth magnesium alloys at high temperatures has been extensively studied, the deformation mechanisms under moderate-to-low temperatures and high strain rates remain insufficiently understood. To address this gap, hot compression tests were conducted on a Mg-11G...
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KeAi Communications Co., Ltd.
2025-06-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956725001112 |
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| author | Jingli Li Chen Wen Xiuzhu Han |
| author_facet | Jingli Li Chen Wen Xiuzhu Han |
| author_sort | Jingli Li |
| collection | DOAJ |
| description | While the deformation behavior of rare-earth magnesium alloys at high temperatures has been extensively studied, the deformation mechanisms under moderate-to-low temperatures and high strain rates remain insufficiently understood. To address this gap, hot compression tests were conducted on a Mg-11Gd-3Y-0.5Zr (wt.%) alloy over a temperature range of 150 °C–450 °C under strain rates of 10⁻³ s⁻¹ (low strain rate (LSR)) and 10 s⁻¹ (high strain rate (HSR)) to explore the strain rate-temperature coupling effects during hot deformation. The results revealed an anomalous increase in peak stress at 150 °C–250 °C as the strain rate decreased, attributed to the combined effects of nano-precipitates, dislocation cell structures, and serrated flow induced by dynamic strain aging. At higher temperatures, strain rate influences softening pathways: under HSR at 450 °C, the effect of twinning shifts from strengthening to facilitating dynamic recrystallization (DRX), resulting in substantial grain refinement (∼4 µm, 81% area fraction at a strain of 0.6). In contrast, at LSR, softening is dominated by dynamic recovery at 350 °C, with limited DRX (∼4 µm grains, 10% area fraction at a strain of 0.6) occurs at 400 °C. These findings clarify the dual role of twinning and its interaction with rate-temperature conditions, providing valuable insights into optimizing the hot processing of rare-earth magnesium alloys. |
| format | Article |
| id | doaj-art-bf9a75c5c57e44d980ecbd8d028f0db8 |
| institution | OA Journals |
| issn | 2213-9567 |
| language | English |
| publishDate | 2025-06-01 |
| publisher | KeAi Communications Co., Ltd. |
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| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-bf9a75c5c57e44d980ecbd8d028f0db82025-08-20T02:37:24ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672025-06-011362913292610.1016/j.jma.2025.03.018Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effectsJingli Li0Chen Wen1Xiuzhu Han2Institute for Advanced Materials, North China Electric Power University, Beijing 102206, ChinaBeijing Spacecrafts Manufacturing Factory Co. Ltd., Beijing 100094, ChinaBeijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China; Corresponding author.While the deformation behavior of rare-earth magnesium alloys at high temperatures has been extensively studied, the deformation mechanisms under moderate-to-low temperatures and high strain rates remain insufficiently understood. To address this gap, hot compression tests were conducted on a Mg-11Gd-3Y-0.5Zr (wt.%) alloy over a temperature range of 150 °C–450 °C under strain rates of 10⁻³ s⁻¹ (low strain rate (LSR)) and 10 s⁻¹ (high strain rate (HSR)) to explore the strain rate-temperature coupling effects during hot deformation. The results revealed an anomalous increase in peak stress at 150 °C–250 °C as the strain rate decreased, attributed to the combined effects of nano-precipitates, dislocation cell structures, and serrated flow induced by dynamic strain aging. At higher temperatures, strain rate influences softening pathways: under HSR at 450 °C, the effect of twinning shifts from strengthening to facilitating dynamic recrystallization (DRX), resulting in substantial grain refinement (∼4 µm, 81% area fraction at a strain of 0.6). In contrast, at LSR, softening is dominated by dynamic recovery at 350 °C, with limited DRX (∼4 µm grains, 10% area fraction at a strain of 0.6) occurs at 400 °C. These findings clarify the dual role of twinning and its interaction with rate-temperature conditions, providing valuable insights into optimizing the hot processing of rare-earth magnesium alloys.http://www.sciencedirect.com/science/article/pii/S2213956725001112Mg-RE alloysRate-temperature couplingAnomalous strengtheningHot deformationSoftening behavior |
| spellingShingle | Jingli Li Chen Wen Xiuzhu Han Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects Journal of Magnesium and Alloys Mg-RE alloys Rate-temperature coupling Anomalous strengthening Hot deformation Softening behavior |
| title | Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects |
| title_full | Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects |
| title_fullStr | Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects |
| title_full_unstemmed | Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects |
| title_short | Unveiling anomalous strengthening and deformation mechanism evolution in a Mg-Gd-Y-Zr alloy under rate-temperature coupling effects |
| title_sort | unveiling anomalous strengthening and deformation mechanism evolution in a mg gd y zr alloy under rate temperature coupling effects |
| topic | Mg-RE alloys Rate-temperature coupling Anomalous strengthening Hot deformation Softening behavior |
| url | http://www.sciencedirect.com/science/article/pii/S2213956725001112 |
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