Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructures
3.2. Mechanical Properties
3.3. Fractography
4. Conclusions
- The grain size of as-extruded materials (~10.9 μm) is refined significantly by 1-pass ECAP (~5.8 μm), and resulted in a remarkably enhanced elongation to failure (EL) (~+62%) with a slightly decreased strength (~−3%) comparing to the as-extruded condition (EL = ~11.3%, UTS = ~200 MPa). The EL is further increased to ~27.3% (~+142%) after 4-pass ECAP compared to the as-extruded condition, which is mainly due to the much more homogenized microstructure. The split basal poles with about 60° rotations to the extruded direction (ED) and the relatively coarsened grain size by SRX and post-DRX after 4-pass ECAP might be responsible for the decreased strength with increasing ECAP pass.
- With increasing ECAP pass, the proportions of cleavage planes decreasing and more highly developed tearing ridges, tiny dimples are observed indicating large plastic deformation occurred before fracture, which is consistent with the remarkable enhancement of the EL.
- Annealing treatments indicate that recovery dominantly occurs at 300 °C, SRX and grain growth emerge at 350 °C and 400 °C, respectively. Meanwhile, the grain growth and hardness decrease rapidly even within 5 min for 1-pass ECAPed alloy at annealing temperature 400 °C, implying a larger grain boundary mobility induced by higher deformation energy than the as-extruded ones.
Acknowledgments
Author Contributions
Conflicts of Interest
References
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Wei, J.; Huang, G.; Yin, D.; Li, K.; Wang, Q.; Zhou, H. Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy. Metals 2017, 7, 119. https://doi.org/10.3390/met7040119
Wei J, Huang G, Yin D, Li K, Wang Q, Zhou H. Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy. Metals. 2017; 7(4):119. https://doi.org/10.3390/met7040119
Chicago/Turabian StyleWei, Jie, Guanghao Huang, Dongdi Yin, Kangning Li, Qudong Wang, and Hao Zhou. 2017. "Effects of ECAP and Annealing Treatment on the Microstructure and Mechanical Properties of Mg-1Y (wt. %) Binary Alloy" Metals 7, no. 4: 119. https://doi.org/10.3390/met7040119