Microstructure, texture, mechanical properties, and corrosion behavior of biodegradable Zn-0.2Mg alloy processed by multi-directional forging
This study systematically investigated the microstructure, mechanical properties, and corrosion behavior of an extruded Zn-0.2Mg alloy processed by multi-directional forging (MDF) at 100 °C. The mean grain size was remarkably decreased from 17.2¿±¿0.5 µm to 1.9¿±¿0.3 µm, and 84.4% of the microstruct...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2024 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/426996 |
| Acceso en línea: | https://hdl.handle.net/2117/426996 https://dx.doi.org/10.1007/s40195-024-01792-z |
| Access Level: | acceso abierto |
| Palabra clave: | Zinc-based bioalloy Multi-directional forging (MDF) Microstructure Recrystallization Mechanical properties Corrosion properties Àrees temàtiques de la UPC::Enginyeria química |
| Sumario: | This study systematically investigated the microstructure, mechanical properties, and corrosion behavior of an extruded Zn-0.2Mg alloy processed by multi-directional forging (MDF) at 100 °C. The mean grain size was remarkably decreased from 17.2¿±¿0.5 µm to 1.9¿±¿0.3 µm, and 84.4% of the microstructure was occupied by grains of below 1 µm in size after applying three MDF passes. Electron backscattered diffraction examinations revealed that continuous dynamic recrystallization, progressive lattice rotation, and particle-stimulated nucleation mechanisms were recognized as contributing to microstructural evolution. Furthermore, transmission electron microscopy results showed that nanoparticles of Mg/Zn dynamically formed under high strain MDF, while the initial extrusion fiber texture was altered to be¿<¿0001¿>¿parallel to the final forging axis. A synergistic effect of grain refinement, texture evolution, second-phase precipitates, and dislocation strengthening resulted in an increased ultimate tensile strength of 232¿±¿5 MPa after three MDF passes. However, this was accompanied by a reduction in the elongation (8¿±¿2.1%). Additionally, a high corrosion rate of 0.59 mm/year was measured for the experimental alloy fabricated by 3 MDF passes. In agreement with the latter, electrochemical impedance spectroscopy results indicated that the grain refinement improved the passivation kinetics of the oxide layer. |
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