Dynamic Recrystallization and Grain Refinement in Extruded AZ31 Rod During Hot Torsion Deformation at 150 °C
| Autor: | Bo Song, Hongbing Chen, Jiejun He, Tingting Liu, Tao Zhou, Ning Guo |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
020502 materials Metals and Alloys Torsion (mechanics) 02 engineering and technology Condensed Matter Physics Microstructure High strain 0205 materials engineering Mechanics of Materials Solid mechanics Materials Chemistry Shear stress Dynamic recrystallization Extrusion Composite material Crystal twinning |
| Zdroj: | Metals and Materials International. 25:147-158 |
| ISSN: | 2005-4149 1598-9623 |
| DOI: | 10.1007/s12540-018-0177-5 |
| Popis: | The dynamic recrystallization mechanism and microstructure evolution in an extruded AZ31 rod during hot torsion deformation at 150 °C were investigated. It indicated that several dynamic recrystallization mechanisms were initiated during hot torsion deformation, including discontinuous DRX (DDRX), continuous DRX (CDRX) and twinning induced DRX (TDRX). With increasing strain, CDRX became the dominant DRX mechanism and contributed to a remarkable refinement of grains. A gradient distribution of dynamic recrystallization grains on the cross section of samples generated due to the gradient shear strain in twisted samples. Hot torsion can also arouse the c-axis of grains to rotate towards the extrusion direction. From low strain to high strain, the recrystallized grains exhibited a similar texture development with the deformed grains. The relevant mechanisms were revealed. |
| Databáze: | OpenAIRE |
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