Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy
Abstract
:1. Introduction
2. Experimental Procedure
3. Results and Discussion
3.1. The Initial Microstructure of the Homogenized Mg-3Sn-2Al-1Zn-5Li Alloy
3.2. Hot Compression Flow Behavior
3.3. Constitutive Equation
3.4. Processing Maps
3.5. Microstructure Analysis
4. Conclusions
- (1)
- The stress-strain curves of the hot-compressed Mg-3Sn-2Al-1Zn-5Li alloy under thermal compression are featured by dynamic softening. As the strain increases, the work hardening effect is more significant. Then, the stress decreases slowly and tends to be flat after the peak value due to the dynamic recovery and dynamic recrystallization. Under the same strain rate, the true stress decreases with the increase of temperature. While under the same temperature, the peak stress of the alloy decreases with the decrease of strain rate.
- (2)
- The constitutive equation of the hot compression of Mg-3Sn-2Al-1Zn-5Li alloy has been established. The activation energy Q is 138.89414 kJ/mol as a result of the composite effect of Li and Sn, according to previous research. The stress index n is 6.25, indicating that the deformation mechanism of the alloy is the cross slip of dislocation. The constitutive equation is
- (3)
- The stability domains of the alloy occur mainly in the low strain rate zone, and the high-efficiency zone appears at 300–350 °C/0.001–0.006 s−1. Combined with EBSD maps, both CDRX and DDRX dominate at 350 °C/0.001 s−1 but the softening effect of DRV is more obvious. Instead, the instability domains mainly occur at higher strain rate, which is due to the potential of the formation of adiabatic shear zone under this condition so as to result in flow instability.
- (4)
- At 350 °C/0.001 s−1 of the high-efficiency zone, a large number of dislocation pile-ups lie at the grain boundaries and sub-grains are found in the dislocation enrichment area. This shows that using the CDRX mechanism leads to the dislocation absorption and gradual rotation of the subgrains.
Author Contributions
Funding
Conflicts of Interest
References
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Guo, Y.; Xuanyuan, Y.; Lia, C.; Yang, S. Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy. Metals 2019, 9, 1262. https://doi.org/10.3390/met9121262
Guo Y, Xuanyuan Y, Lia C, Yang S. Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy. Metals. 2019; 9(12):1262. https://doi.org/10.3390/met9121262
Chicago/Turabian StyleGuo, Yuhang, Yaodong Xuanyuan, Chunnan Lia, and Sen Yang. 2019. "Characterization of Hot Deformation Behavior and Processing Maps of Mg-3Sn-2Al-1Zn-5Li Magnesium Alloy" Metals 9, no. 12: 1262. https://doi.org/10.3390/met9121262