Effect of Hot Extrusion on Microstructure, Texture, and Mechanical Properties of Mg-Zn-Mn-0.5Ca Alloy
Abstract
:1. Introduction
2. Experimental Procedure
- Preheating and insulation of the mold: Heat the furnace to 50 °C above the extrusion temperature to preheat the mold. Once the internal temperature of the extrusion cylinder reaches the extrusion temperature, adjust the furnace temperature to maintain insulation at the extrusion temperature for 2 h.
- Billet insulation: After the mold insulation time elapses, apply lubricant to the inner wall of the extrusion cylinder and the surface of the billet. Sequentially place the billet and spacer into the extrusion mold for heating and insulation, maintaining it for 1 h.
- Hot extrusion deformation: Insert the extrusion rod into the mold, set the stroke speed of the extrusion machine, and commence extrusion, ensuring temperature control during the process.
- Unloading and mold removal: Upon completion of extrusion, saw the extruded rod for air cooling, label it appropriately, then remove the mold. Clean the spacer and interior of the extrusion cylinder for subsequent extrusion processes.
3. Results and Discussion
3.1. Microstructure of Extruded Rods
- : strain rate;
- Q: activation energy, Mg activation energy of 135 KJ/mol;
- R: gas constant;
- T: deformation temperature.
- dDRX: recrystallization grain diameter;
- A: constant;
- n: power law exponent.
3.2. Recrystallization Distribution Texture Evolution of Extruded Rods under Different Extrusion Conditions
3.2.1. Extrusion at Different Temperature Conditions
3.2.2. Different Speed Extrusion Conditions
3.3. Mechanical Properties
4. Conclusions
- (1)
- With the decrease in extrusion temperature, the recrystallization region of the alloy decreases and the recrystallization grains become finer. Tensile strength and yield strength increase with the decrease in extrusion temperature, and the elongation decreases. At the same time, the texture of the recrystallization zone of the alloy decreases, while the overall texture of the alloy is slightly enhanced. With the decrease in extrusion speed, the non-recrystallized region expands and the recrystallized grain size decreases. In general, the tensile strength and yield strength increase with the decrease in extrusion speed, while the elongation tends to decrease. The texture strength of the recrystallization zone of the alloy decreases with the increase in the extrusion speed, and the texture of the alloy increases with the increase in the extrusion speed.
- (2)
- On the basis of observing the microstructure and recrystallized grains of the sample, the mechanical properties of the sample obtained under the selected parameters were tested. It was found that the comprehensive mechanical properties of the sample were the best when the temperature was 300 °C and the extrusion speed was 0.1 mm/s, which is expected to become a reference in the actual production process.
Author Contributions
Funding
Data Availability Statement
Conflicts of Interest
References
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Samples | Yield Strength/MPa | Tensile Strength/MPa | Elongation/% |
---|---|---|---|
260 °C extrusion | 281 ± 2 | 329 ± 4 | 11.6 ± 0.1 |
300 °C extrusion | 254 ± 3 | 342 ± 2 | 15.8 ± 0.2 |
340 °C extrusion | 202 ± 2 | 306 ± 3 | 18.9 ± 0.1 |
Samples | Yield Strength/MPa | Tensile Strength/MPa | Elongation/% |
---|---|---|---|
0.01 mm/s extrusion | 224 ± 3 | 322 ± 2 | 19.1 ± 0.2 |
0.1 mm/s extrusion | 254 ± 3 | 342 ± 2 | 15.8 ± 0.2 |
1 mm/s extrusion | 206 ± 1 | 331 ± 4 | 12.7 ± 0.2 |
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Li, M.; Yao, M.; Yang, Y.; Zhao, G.; Wang, Y.; Shu, D.; Chai, S.; Zhang, F.; Xia, X.; Wan, Y.; et al. Effect of Hot Extrusion on Microstructure, Texture, and Mechanical Properties of Mg-Zn-Mn-0.5Ca Alloy. Metals 2024, 14, 1112. https://doi.org/10.3390/met14101112
Li M, Yao M, Yang Y, Zhao G, Wang Y, Shu D, Chai S, Zhang F, Xia X, Wan Y, et al. Effect of Hot Extrusion on Microstructure, Texture, and Mechanical Properties of Mg-Zn-Mn-0.5Ca Alloy. Metals. 2024; 14(10):1112. https://doi.org/10.3390/met14101112
Chicago/Turabian StyleLi, Ming, Mengling Yao, Yuhang Yang, Gaozhan Zhao, Yongxiang Wang, Dayu Shu, Shuxin Chai, Feiyue Zhang, Xiangsheng Xia, Yuanyuan Wan, and et al. 2024. "Effect of Hot Extrusion on Microstructure, Texture, and Mechanical Properties of Mg-Zn-Mn-0.5Ca Alloy" Metals 14, no. 10: 1112. https://doi.org/10.3390/met14101112