Hot Deformation Behavior and Microstructural Evolution Based on the Processing Map of Dual-Phase Mg-Li Based Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure of As-Extruded Mg-Li-Al-Zn-Si Alloy
3.2. True Stress–Strain Curves
3.3. Constitutive Equation
3.4. Processing Map
3.4.1. Establishment of Processing Map
3.4.2. Microstructural Analysis Based on the Processing Map
4. Conclusions
- (1)
- At the temperature range of 180–330 °C and strain rate range of 0.01–10 s−1, the flow-stress–true-strain curves for the Mg-Li-Al-Zn-Si alloy are sensitive to the deformation temperature and strain rate. The shape transformation from the multiple to single peak of the flow-stress–true-strain curves with the increasing strain rate was caused by the DRX cycle.
- (2)
- The constitutive equation was found to precisely predict flow stress at high temperatures (>240 °C) but showed significant deviation at low temperatures.
- (3)
- The processing map based on DMM at the strain of 0.7 was established for the Mg-Li-Al-Zn-Si alloy. The peak power dissipation efficiency is 0.44 when the deformation conditions are 300 °C/0.1 s−1 and 270 °C/0.01 s−1. The unsafe domains are detected at low temperatures (<230 °C) and high temperatures (>280 °C) with high strain rates (>1 s−1) that should be avoided.
- (4)
- The dominant nucleation mechanism of DRX in the safe region of the Mg-Li-Al-Zn-Si alloy is different in two phases. In the α-phase, CDRX occurs with the accumulation of dislocations in subgrain boundaries, leading to the increase in their orientation. The microstructure of the β-phase exhibits a DDRX character.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Li | Al | Zn | Si | Mg |
---|---|---|---|---|
10.10 | 2.98 | 3.12 | 0.22 | Bal. |
α | Value | N | Value | Q | Value/(kJ/mol) | lnA | Value |
---|---|---|---|---|---|---|---|
α0 | 0.021 | n0 | 4.580 | Q0 | 152.508 | A0 | 32.906 |
α1 | 0.020 | n1 | −11.689 | Q1 | −495.219 | A1 | −107.133 |
α2 | −0.088 | n2 | 80.028 | Q2 | 4475.528 | A2 | 914.041 |
α3 | 0.173 | n3 | −308.404 | Q3 | −18,940.418 | A3 | −3753.913 |
α4 | −0.019 | n4 | 644.671 | Q4 | 40,466.631 | A4 | 7862.544 |
α5 | −0.311 | n5 | −677.602 | Q5 | −42,731.404 | A5 | −8179.457 |
α6 | 0.258 | n6 | 282.294 | Q6 | 17,758.101 | A6 | 3359.740 |
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Guo, J.; Guo, S.; Shen, Y.; Li, D. Hot Deformation Behavior and Microstructural Evolution Based on the Processing Map of Dual-Phase Mg-Li Based Alloy. Materials 2022, 15, 1022. https://doi.org/10.3390/ma15031022
Guo J, Guo S, Shen Y, Li D. Hot Deformation Behavior and Microstructural Evolution Based on the Processing Map of Dual-Phase Mg-Li Based Alloy. Materials. 2022; 15(3):1022. https://doi.org/10.3390/ma15031022
Chicago/Turabian StyleGuo, Jiangtao, Shengli Guo, Yazhao Shen, and Defu Li. 2022. "Hot Deformation Behavior and Microstructural Evolution Based on the Processing Map of Dual-Phase Mg-Li Based Alloy" Materials 15, no. 3: 1022. https://doi.org/10.3390/ma15031022