Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion
On certain occasions, such as bending, a sheet with gradient microstructure may present higher formability compared to one with uniform microstructure. In this study, the formation of gradient microstructure in AZ31 alloy sheets extruded by the asymmetric die is comprehensively investigated. The res...
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| Format: | Article |
| Language: | English |
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Elsevier
2024-05-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424006409 |
| _version_ | 1797220252094824448 |
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| author | Lintao Liu Yan Song Jieyu Li Chao He Shengwen Bai Bin Jiang Jiangfeng Song Guangsheng Huang Dingfei Zhang Fusheng Pan |
| author_facet | Lintao Liu Yan Song Jieyu Li Chao He Shengwen Bai Bin Jiang Jiangfeng Song Guangsheng Huang Dingfei Zhang Fusheng Pan |
| author_sort | Lintao Liu |
| collection | DOAJ |
| description | On certain occasions, such as bending, a sheet with gradient microstructure may present higher formability compared to one with uniform microstructure. In this study, the formation of gradient microstructure in AZ31 alloy sheets extruded by the asymmetric die is comprehensively investigated. The results exhibit the microstructure evolution undergoes three stages, namely the initial dynamic recrystallization (DRX), abnormal grain growth (AGG), and the secondary DRX. After the initial DRX, the microstructure is fine and uniform, and the transverse direction (TD) preferred texture is formed due to the initiation of non-basal slip. Owing to the high extrusion temperature, AGG occurs after the initial DRX. The grains with basal texture are engulfed by the grains with TD-preferred texture. During the AGG, the grain size is coarsened from 11.4 μm to 382.1 μm. As the material flows through the die bearing, the secondary DRX occurs near the corner of the die. Ascribed to the gradient strain near the bearing, the grains near the bottom surface of the sheet are refined again, while those near the other side inherit the large sizes from grown grains. Ultimately, the extruded sheet exhibits gradient microstructure along the thickness direction, i.e. normal direction (ND). The gradient-distributed plastic strain and strain rate are the main causes of gradient microstructure. |
| first_indexed | 2024-04-24T12:46:35Z |
| format | Article |
| id | doaj.art-3953e4d52b4d4664aab1c0b163308b38 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-04-24T12:46:35Z |
| publishDate | 2024-05-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-3953e4d52b4d4664aab1c0b163308b382024-04-07T04:35:45ZengElsevierJournal of Materials Research and Technology2238-78542024-05-013024682477Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusionLintao Liu0Yan Song1Jieyu Li2Chao He3Shengwen Bai4Bin Jiang5Jiangfeng Song6Guangsheng Huang7Dingfei Zhang8Fusheng Pan9National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; China Automotive Engineering Research Institute Co., Ltd, Chongqing, 4001122, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; Lanxi Magnesium Materials Research Insititute, Lanxi, 321100, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, 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; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China; Corresponding author. College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, China.National Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaNational Engineering Research Center for Magnesium Alloys, Chongqing University, Chongqing, 400044, China; College of Materials Science and Engineering, Chongqing University, Chongqing, 400044, ChinaOn certain occasions, such as bending, a sheet with gradient microstructure may present higher formability compared to one with uniform microstructure. In this study, the formation of gradient microstructure in AZ31 alloy sheets extruded by the asymmetric die is comprehensively investigated. The results exhibit the microstructure evolution undergoes three stages, namely the initial dynamic recrystallization (DRX), abnormal grain growth (AGG), and the secondary DRX. After the initial DRX, the microstructure is fine and uniform, and the transverse direction (TD) preferred texture is formed due to the initiation of non-basal slip. Owing to the high extrusion temperature, AGG occurs after the initial DRX. The grains with basal texture are engulfed by the grains with TD-preferred texture. During the AGG, the grain size is coarsened from 11.4 μm to 382.1 μm. As the material flows through the die bearing, the secondary DRX occurs near the corner of the die. Ascribed to the gradient strain near the bearing, the grains near the bottom surface of the sheet are refined again, while those near the other side inherit the large sizes from grown grains. Ultimately, the extruded sheet exhibits gradient microstructure along the thickness direction, i.e. normal direction (ND). The gradient-distributed plastic strain and strain rate are the main causes of gradient microstructure.http://www.sciencedirect.com/science/article/pii/S2238785424006409Gradient microstructureDynamic recrystallizationAbnormal grain growthMagnesium alloyAsymmetric extrusion |
| spellingShingle | Lintao Liu Yan Song Jieyu Li Chao He Shengwen Bai Bin Jiang Jiangfeng Song Guangsheng Huang Dingfei Zhang Fusheng Pan Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion Journal of Materials Research and Technology Gradient microstructure Dynamic recrystallization Abnormal grain growth Magnesium alloy Asymmetric extrusion |
| title | Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion |
| title_full | Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion |
| title_fullStr | Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion |
| title_full_unstemmed | Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion |
| title_short | Unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned-bearing extrusion |
| title_sort | unveiling the formation of gradient microstructure in the magnesium alloy sheet fabricated via turned bearing extrusion |
| topic | Gradient microstructure Dynamic recrystallization Abnormal grain growth Magnesium alloy Asymmetric extrusion |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424006409 |
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