Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures
The ductility and toughness of peak-aged (PA) Mg-RE alloys are significantly influenced by their grain structure characteristics. To investigate this issue, we examined PA Mg-8.24Gd-2.68Y (wt.%) alloys with two distinct grain structures: an extruded-PA sample with dynamic recrystallized (DRXed) fine...
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KeAi Communications Co., Ltd.
2024-10-01
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| Series: | Journal of Magnesium and Alloys |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2213956723002086 |
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| author | Jiangli Ning Jialiao Zhou Bosong Gao Chunlei Zhang Hailong Shi Liansheng Chen Xiaojun Wang |
| author_facet | Jiangli Ning Jialiao Zhou Bosong Gao Chunlei Zhang Hailong Shi Liansheng Chen Xiaojun Wang |
| author_sort | Jiangli Ning |
| collection | DOAJ |
| description | The ductility and toughness of peak-aged (PA) Mg-RE alloys are significantly influenced by their grain structure characteristics. To investigate this issue, we examined PA Mg-8.24Gd-2.68Y (wt.%) alloys with two distinct grain structures: an extruded-PA sample with dynamic recrystallized (DRXed) fine grains and coarse hot-worked grains, and an extrusion-solution treated and PA sample with grown large equiaxed grains. The results showed that the extruded-PA sample demonstrated a favorable combination of tensile strength (426 MPa) and ductility (7.0 %). Although intergranular microcracks nucleated in the DRXed region due to strain incompatibility, crack propagation was impeded by the DRXed fine grains, inducing intrinsic and extrinsic toughening mechanisms. On the other hand, the hot-worked grains in the extruded-PA sample initiated transgranular cracks after a relatively high strain, attributed to the strain partitioning effect, ultimately leading to failure. In comparison, the solution-treated-PA sample exhibited lower tensile strength and ductility (338 MPa and 3.7 %, respectively). Intergranular cracks nucleated in the CG sample before necking, and the readily formed critical crack, facilitated by the large grain size, exhibited unstable crack growth, resulting in premature failure. This work offers valuable insights for designing high-performance PA Mg-RE alloys and preventing premature failure in practical applications. |
| format | Article |
| id | doaj-art-55baeaf7eade4b03996fc9520c4ebd91 |
| institution | Kabale University |
| issn | 2213-9567 |
| language | English |
| publishDate | 2024-10-01 |
| publisher | KeAi Communications Co., Ltd. |
| record_format | Article |
| series | Journal of Magnesium and Alloys |
| spelling | doaj-art-55baeaf7eade4b03996fc9520c4ebd912024-11-27T05:02:21ZengKeAi Communications Co., Ltd.Journal of Magnesium and Alloys2213-95672024-10-01121041404156Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structuresJiangli Ning0Jialiao Zhou1Bosong Gao2Chunlei Zhang3Hailong Shi4Liansheng Chen5Xiaojun Wang6Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, China; Corresponding authors.Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, ChinaKey Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, ChinaDepartment of Mechanical Engineering, National Univeristy of Singapore, 117581, SingaporeNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; Corresponding authors.Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan 063210, ChinaNational Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, ChinaThe ductility and toughness of peak-aged (PA) Mg-RE alloys are significantly influenced by their grain structure characteristics. To investigate this issue, we examined PA Mg-8.24Gd-2.68Y (wt.%) alloys with two distinct grain structures: an extruded-PA sample with dynamic recrystallized (DRXed) fine grains and coarse hot-worked grains, and an extrusion-solution treated and PA sample with grown large equiaxed grains. The results showed that the extruded-PA sample demonstrated a favorable combination of tensile strength (426 MPa) and ductility (7.0 %). Although intergranular microcracks nucleated in the DRXed region due to strain incompatibility, crack propagation was impeded by the DRXed fine grains, inducing intrinsic and extrinsic toughening mechanisms. On the other hand, the hot-worked grains in the extruded-PA sample initiated transgranular cracks after a relatively high strain, attributed to the strain partitioning effect, ultimately leading to failure. In comparison, the solution-treated-PA sample exhibited lower tensile strength and ductility (338 MPa and 3.7 %, respectively). Intergranular cracks nucleated in the CG sample before necking, and the readily formed critical crack, facilitated by the large grain size, exhibited unstable crack growth, resulting in premature failure. This work offers valuable insights for designing high-performance PA Mg-RE alloys and preventing premature failure in practical applications.http://www.sciencedirect.com/science/article/pii/S2213956723002086In-situ tensile testMg-RE alloyGrain structureDeformation modeFracture mechanism |
| spellingShingle | Jiangli Ning Jialiao Zhou Bosong Gao Chunlei Zhang Hailong Shi Liansheng Chen Xiaojun Wang Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures Journal of Magnesium and Alloys In-situ tensile test Mg-RE alloy Grain structure Deformation mode Fracture mechanism |
| title | Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures |
| title_full | Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures |
| title_fullStr | Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures |
| title_full_unstemmed | Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures |
| title_short | Deformation modes and fracture behaviors of peak-aged Mg-Gd-Y alloys with different grain structures |
| title_sort | deformation modes and fracture behaviors of peak aged mg gd y alloys with different grain structures |
| topic | In-situ tensile test Mg-RE alloy Grain structure Deformation mode Fracture mechanism |
| url | http://www.sciencedirect.com/science/article/pii/S2213956723002086 |
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