Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests
Abstract
:1. Introduction
2. Theory of Processing Map
3. Materials and Methods
4. Results and Discussion
4.1. Microstructure of As-Cast and Homogenized Samples
4.2. Compression Behavior and Microstructure Evolution
4.2.1. Flow Stress Behavior
4.2.2. Effect of Temperature
4.2.3. Effect of Strain Rate
4.3. Kinetic Analysis
4.4. Characterization of Processing Map and Microstructure of Stability and Instability Regions
5. Conclusions
- (1)
- The homogenized alloy exhibits the typical dynamic recrystallization behavior characteristics. The flow stress increases with the decrease of temperature and the increase of strain rate. Meanwhile, the true stress-strain curves tell that the high strain rate and low temperature make a high work hardening rate.
- (2)
- The constitutive equation of the homogenized alloy is and the deformation activation energy Q (~263.15 kJ/mol) of homogenized alloy is much higher than that of pure Mg (~135 kJ/mol), which is due to the existence of LPSO phases.
- (3)
- LPSO kink deformation becomes an important mean to coordinate deformation when it is difficult to start the sliding system of magnesium alloy during deformation at low temperature. From the further observation of the microstructure evolution, the DRX softening enhances with the increase of temperature which makes the slip system easy to slide. Meanwhile, the flow instability and the stress concentration become serious and the micro-cracks are produced at the intersection of kinks where the lump LPSO phases gather.
- (4)
- According to the processing map, dynamic recrystallization behavior with the strain of 0.5 occurs at two high power dissipation zones: 370–440 °C/0.001–0.006 s−1 and 465–500 °C/0.001–0.05 s−1, respectively, which correspond to the peak power dissipation of 44%. From the observation of compressed specimens, the optimum condition for hot plastic deformation is 465–500 °C/0.001–0.05 s−1.
Author Contributions
Acknowledgments
Conflicts of Interest
References
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Points | Mg | Gd | Y | Zn | Zr |
---|---|---|---|---|---|
1# | 98.20 | 0.55 | 0.23 | 0.80 | 0.22 |
2# | 88.03 | 4.21 | 2.62 | 5.03 | 0.11 |
3# | 81.89 | 11.35 | 4.32 | 2.10 | 0.34 |
4# | 29.10 | 24.83 | 42.51 | 0.71 | 2.85 |
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Zhang, Z.; Yan, Z.; Du, Y.; Zhang, G.; Zhu, J.; Ren, L.; Wang, Y. Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests. Materials 2018, 11, 2282. https://doi.org/10.3390/ma11112282
Zhang Z, Yan Z, Du Y, Zhang G, Zhu J, Ren L, Wang Y. Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests. Materials. 2018; 11(11):2282. https://doi.org/10.3390/ma11112282
Chicago/Turabian StyleZhang, Zhimin, Zhaoming Yan, Yue Du, Guanshi Zhang, Jiaxuan Zhu, Luying Ren, and Yiding Wang. 2018. "Hot Deformation Behavior of Homogenized Mg-13.5Gd-3.2Y-2.3Zn-0.5Zr Alloy via Hot Compression Tests" Materials 11, no. 11: 2282. https://doi.org/10.3390/ma11112282