Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed
A low-alloyed Mg-1.2Zn-0.6Al-0.1Ca (wt.%) alloy was extruded at 200 °C with different ram speeds (0.5–4.0 mm/s), and the microstructure and mechanical properties were studied systematically. Heterostructures with fine dynamic recrystallized (DRXed) grains and coarse unDRXed grains were achieved at l...
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Elsevier
2024-11-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785424020994 |
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| author | L. Liu H. Wang D.T. Zhang C. Qiu D.L. Chen |
| author_facet | L. Liu H. Wang D.T. Zhang C. Qiu D.L. Chen |
| author_sort | L. Liu |
| collection | DOAJ |
| description | A low-alloyed Mg-1.2Zn-0.6Al-0.1Ca (wt.%) alloy was extruded at 200 °C with different ram speeds (0.5–4.0 mm/s), and the microstructure and mechanical properties were studied systematically. Heterostructures with fine dynamic recrystallized (DRXed) grains and coarse unDRXed grains were achieved at lower ram speeds of 0.5 mm/s and 1.0 mm/s, and fully-DRXed microstructure was attained at 4.0 mm/s. Increasing the extrusion speed resulted in an increase in DRXed grain size from 0.9 μm to 3.8 μm, and a transformation of the DRXed texture component from <10 to 10>−<11–20> to a new orientation that deviated by approximately 14°. The sample extruded at 0.5 mm/s presented an excellent tensile yield strength (TYS) of 369 MPa along with a 7.8% elongation, which was mainly due to the high hetero-deformation induced (HDI) strengthening provided by its heterostructures. Increasing ram speed resulted in an improved elongation despite a decreased TYS. The reasons for the decreased strength with increasing extrusion speed were mainly associated with grain growth, reduced dislocation density and weakened HDI strengthening. The reasons for the improved ductility with increasing extrusion speed were largely due to the increased DRXed grains fraction with soft orientations. |
| first_indexed | 2025-02-17T13:26:15Z |
| format | Article |
| id | doaj.art-c4e06de868784b0690d3b16b622e18a0 |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2025-02-17T13:26:15Z |
| publishDate | 2024-11-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-c4e06de868784b0690d3b16b622e18a02024-12-26T08:53:41ZengElsevierJournal of Materials Research and Technology2238-78542024-11-013311651175Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speedL. Liu0H. Wang1D.T. Zhang2C. Qiu3D.L. Chen4Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaGuangdong Key Laboratory for Advanced Metallic Materials Processing and Forming, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, China; Department of Mechanical, Industrial and Mechatronics Engineering, Toronto Metropolitan University, Toronto, Ontario, M5B 2K3, CanadaGuangdong Key Laboratory for Advanced Metallic Materials Processing and Forming, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, China; Corresponding author.Guangdong Key Laboratory for Advanced Metallic Materials Processing and Forming, National Engineering Research Center of Near-net-shape Forming for Metallic Materials, South China University of Technology, Guangzhou, 510640, ChinaDepartment of Mechanical, Industrial and Mechatronics Engineering, Toronto Metropolitan University, Toronto, Ontario, M5B 2K3, Canada; Corresponding author.A low-alloyed Mg-1.2Zn-0.6Al-0.1Ca (wt.%) alloy was extruded at 200 °C with different ram speeds (0.5–4.0 mm/s), and the microstructure and mechanical properties were studied systematically. Heterostructures with fine dynamic recrystallized (DRXed) grains and coarse unDRXed grains were achieved at lower ram speeds of 0.5 mm/s and 1.0 mm/s, and fully-DRXed microstructure was attained at 4.0 mm/s. Increasing the extrusion speed resulted in an increase in DRXed grain size from 0.9 μm to 3.8 μm, and a transformation of the DRXed texture component from <10 to 10>−<11–20> to a new orientation that deviated by approximately 14°. The sample extruded at 0.5 mm/s presented an excellent tensile yield strength (TYS) of 369 MPa along with a 7.8% elongation, which was mainly due to the high hetero-deformation induced (HDI) strengthening provided by its heterostructures. Increasing ram speed resulted in an improved elongation despite a decreased TYS. The reasons for the decreased strength with increasing extrusion speed were mainly associated with grain growth, reduced dislocation density and weakened HDI strengthening. The reasons for the improved ductility with increasing extrusion speed were largely due to the increased DRXed grains fraction with soft orientations.http://www.sciencedirect.com/science/article/pii/S2238785424020994Low-alloyed magnesium alloyExtrusion speedHeterostructureTextureMechanical properties |
| spellingShingle | L. Liu H. Wang D.T. Zhang C. Qiu D.L. Chen Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed Journal of Materials Research and Technology Low-alloyed magnesium alloy Extrusion speed Heterostructure Texture Mechanical properties |
| title | Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed |
| title_full | Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed |
| title_fullStr | Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed |
| title_full_unstemmed | Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed |
| title_short | Microstructure and mechanical properties of a low-alloyed Mg–Zn–Al–Ca alloy: Effect of extrusion speed |
| title_sort | microstructure and mechanical properties of a low alloyed mg zn al ca alloy effect of extrusion speed |
| topic | Low-alloyed magnesium alloy Extrusion speed Heterostructure Texture Mechanical properties |
| url | http://www.sciencedirect.com/science/article/pii/S2238785424020994 |
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