Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion
Abstract
:1. Introduction
2. Materials and Methods
3. Results
3.1. Evolution of Microstructure
3.2. Texture Evolution
4. Discussion
4.1. The Effect of unDRXed Region on Grain Orientation
4.2. DRX Behavior and Its Influence on Grain Orientation
5. Conclusions
- The RUE deformation has a significant effect on the grain refinement of the Mg alloy. The fraction of DRXed grains is significantly improved and homogeneous microstructure with statistically average grain size of 7.6 μm was obtained.
- Mg5(Gd-Y) phase is dynamically precipitated during RUE process. With the increase of cumulative strain, the number of particle phases also increases, which is beneficial to promote the generation of DRXed grains through the PSN mechanism and accelerate the process of microstructure refinement. In addition, the precipitated particle phase greatly hinders the migration of GBs through the pinning effect, thereby hindering the growth of DRXed grains.
- RUE deformation can effectively weaken the basal plane texture through CDRX and DDRX mechanisms. In this deformation process, the upsetting has a certain effect on the deflection of the c-axis ED in the subsequent extrusion deformation, so the grain orientation is gradually dispersed with the increase of passes. At the same time, the rare earth elements are added to the alloy. It also has a certain effect on texture weakening.
Author Contributions
Funding
Conflicts of Interest
References
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Wu, G.; Yu, J.; Jia, L.; Xu, W.; Dong, B.; Zhang, Z.; Hao, B. Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion. Materials 2020, 13, 4932. https://doi.org/10.3390/ma13214932
Wu G, Yu J, Jia L, Xu W, Dong B, Zhang Z, Hao B. Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion. Materials. 2020; 13(21):4932. https://doi.org/10.3390/ma13214932
Chicago/Turabian StyleWu, Guoqin, Jianmin Yu, Leichen Jia, Wenlong Xu, Beibei Dong, Zhimin Zhang, and Biying Hao. 2020. "Microstructure and Texture Evolution of Mg-Gd-Y-Zr Alloy during Reciprocating Upsetting-Extrusion" Materials 13, no. 21: 4932. https://doi.org/10.3390/ma13214932