Microstructure Evolution and Dynamic Recrystallization Behavior of Mg-Gd-Y-Zn-Zr Alloy during Rotating Backward Extrusion
| Autor: | Yali Duan, Jianmin Yu, Beibei Dong, Huifang Zhang, Mu Meng, Mei Cheng, Zhimin Zhang, Baohong Zhang, Hongyuan Hao, Ping Xu, Huiling Liu |
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| Rok vydání: | 2021 |
| Předmět: |
Technology
Microscopy QC120-168.85 QH201-278.5 texture evolution dynamic recrystallization (DRX) Engineering (General). Civil engineering (General) TK1-9971 magnesium alloys Descriptive and experimental mechanics gradient structure rotation backward extrusion (RBE) General Materials Science Electrical engineering. Electronics. Nuclear engineering TA1-2040 |
| Zdroj: | Materials; Volume 15; Issue 3; Pages: 1057 Materials, Vol 15, Iss 1057, p 1057 (2022) |
| ISSN: | 1996-1944 |
| Popis: | Rotating backward extrusion (RBE) is one of severe plastic deformation (SPD) methods used to produce cylindrical components with a very large strain by a single pass. In this study, the microstructure and texture evolution in the different regions of Mg-12Gd-4Y-2Zn-0.5Zr (wt.%) alloys via RBE process were investigated by using optical microscopy (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron back-scatter diffraction (EBSD). The results showed that the cup-shaped sample formed by RBE process exhibited typical gradient microstructure expanding from its inner wall to outer wall along the radial direction (RD). The average grain size of the RBEed sample decreased when the radius decreased from the edge region to the center region along the RD, which was attributed to the different strains and strain rates in the different regions. It also could be observed that the center region showed highest deformation and the edge region exhibited the lowest deformation in the RBEed sample along the RD. In addition, the grain refinement mechanisms of the experimental alloy containing long-period stacking ordered (LPSO) phases after RBE with 100 N were continuous dynamic recrystallization (CDRX), discontinuous dynamic recrystallization (DDRX) and particle stimulated nucleation (PSN). |
| Databáze: | OpenAIRE |
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