Hot Deformation Behaviour and Constitutive Equation of Mg-9Gd-4Y-2Zn-0.5Zr Alloy
Abstract
:1. Introduction
2. Methods and Experimental Section
3. Results and Discussion
3.1. True Stress-True Strain Curve
3.2. The Establishment of a Constitutive Equation
3.3. Error Analysis
3.4. Processing Map
4. Conclusions
- The effect of deformation softening can be improved by increasing deformation temperature and decreasing strain rate. The increase in deformation temperature provides more energy and higher grain boundary mobility, which lead to the nucleation and growth of dynamically recrystallized grains and reduce the flow stress level. The dislocations fully spread to achieve reorganization while the strain rate decreases, thus increasing the DRX degree and softening effect. Shear bands and microcracks occurred in the Mg-9Gd-4Y-2Zn-0.5Zr alloy deformed at the temperature of 360–400 °C and strain rate of 0.01–1 s−1.
- Strain has a great influence on material constants, and the constitutive equation constructed by polynomial fitting of material constants corresponding to different strain variables is:
- We observed an obvious effect of strain on the peak power dissipation rate coefficient and instability range. With increasing strain, the dissipation coefficient of the peak power decreased, and the instability range increased gradually. According to the analysis of the hot working diagram, the optimum hot working conditions were a temperature of 400–480 °C and a strain rate of 0.001–0.01 s−1.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Element | Gd | Y | Zn | Zr | Si | Cu | Mg |
---|---|---|---|---|---|---|---|
wt.% | 9.48 | 4.00 | 1.98 | 0.50 | <0.01 | <0.01 | Bal. |
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Nie, Y.; Zheng, J.; Han, R.; Jia, L.; Zhang, Z.; Xue, Y. Hot Deformation Behaviour and Constitutive Equation of Mg-9Gd-4Y-2Zn-0.5Zr Alloy. Materials 2022, 15, 1779. https://doi.org/10.3390/ma15051779
Nie Y, Zheng J, Han R, Jia L, Zhang Z, Xue Y. Hot Deformation Behaviour and Constitutive Equation of Mg-9Gd-4Y-2Zn-0.5Zr Alloy. Materials. 2022; 15(5):1779. https://doi.org/10.3390/ma15051779
Chicago/Turabian StyleNie, Yangjunfeng, Jie Zheng, Rui Han, Leichen Jia, Zhimin Zhang, and Yong Xue. 2022. "Hot Deformation Behaviour and Constitutive Equation of Mg-9Gd-4Y-2Zn-0.5Zr Alloy" Materials 15, no. 5: 1779. https://doi.org/10.3390/ma15051779