Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. Microstructure of as-Cast Alloys
3.2. Microstructure of as-Extruded Alloys
3.3. Heat Resistance of as-Extruded Alloys
3.3.1. “Static” Heat Resistance
3.3.2. “Dynamic” Heat Resistance
3.3.3. Heat Resistance Mechanisms
4. Conclusions
- (1)
- During high-temperature annealing at 703 K, the as-extruded AZB313 alloy had a lower grain growth rate than the as-extruded AZ31, since the Mg3Bi2 phases (distributed at grain boundaries) impeded the grain boundary motion (even though these precipitates were slightly coarsened) providing higher “static” heat resistance.
- (2)
- During hot compression at 298 to 523 K, the yield and ultimate strength of both as-extruded AZ31 and AZB313 alloys gradually decreased, but with the addition of Bi, this tendency could be delayed. The main reasons include the following aspects: (i) strengthened precipitation—the strength contribution of fine Mg3Bi2 phases at room temperature could be maintained at high temperature; (ii) the high thermal stability of the grains—the thermally stable Mg3Bi2 precipitates (dispersed within grains) effectively hindered the movement of dislocations, thereby increasing the resistance to grain deformation; (iii) restricted occurrence of GBS—the pinning effect of the fine precipitates on grain boundaries was very strong, further limiting GBS. Therefore, it was expected that the Bi addition also promoted the enhancement of “dynamic” heat resistance of the as-extruded AZ31 alloy.
Supplementary Materials
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Grain | Strain | Maximum Width | Maximum Height |
---|---|---|---|
G1 | 0% | 15.56 ± 0.22 | 17.38 ± 0.34 |
25% | 13.88 ± 0.32 | 18.08 ± 0.12 | |
G2 | 0% | 7.32 ± 0.24 | 9.40 ± 0.15 |
25% | 6.53 ± 0.21 | 11.69 ± 0.28 | |
G3 | 0% | 19.12 ± 0.15 | 18.75 ± 0.32 |
25% | 16.85 ± 0.18 | 21.01 ± 0.23 | |
G4 | 0% | 8.93 ± 0.23 | 8.62 ± 0.09 |
25% | 7.04 ± 0.27 | 9.98 ± 0.21 | |
G5 | 0% | 10.33 ± 0.32 | 9.62 ± 0.24 |
25% | 10.01 ± 0.25 | 9.68 ± 0.11 | |
G6 | 0% | 11.68 ± 0.14 | 11.87 ± 0.25 |
25% | 11.45 ± 0.31 | 11.92 ± 0.18 | |
G7 | 0% | 5.84 ± 0.11 | 7.25 ± 0.24 |
25% | 5.82 ± 0.13 | 7.30 ± 0.12 | |
G8 | 0% | 6.13 ± 0.32 | 6.44 ± 0.15 |
25% | 5.87 ± 0.14 | 6.50 ± 0.22 |
Alloy | Strain | Ave. Maximum Width | Ave. Maximum Height |
---|---|---|---|
As-extruded AZ31 | 0% | 11.69 ± 0.21 | 10.78 ± 0.33 |
10% | 10.53 ± 0.12 | 11.95 ± 0.14 | |
25% | 10.12 ± 0.31 | 12.47 ± 0.32 | |
As-extruded AZB313 | 0% | 11.78 ± 0.32 | 10.34 ± 0.25 |
10% | 11.28 ± 0.26 | 10.89 ± 0.23 | |
25% | 10.98 ± 0.34 | 11.15 ± 0.42 |
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Wang, Q.; Zhai, H.; Wang, L.; Huang, L.; Zhao, J.; Gao, Y.; Jiang, B. Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy. Materials 2023, 16, 996. https://doi.org/10.3390/ma16030996
Wang Q, Zhai H, Wang L, Huang L, Zhao J, Gao Y, Jiang B. Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy. Materials. 2023; 16(3):996. https://doi.org/10.3390/ma16030996
Chicago/Turabian StyleWang, Qinghang, Haowei Zhai, Li Wang, Lixin Huang, Jun Zhao, Yuyang Gao, and Bin Jiang. 2023. "Effect of Bi Addition on the Heat Resistance of As-Extruded AZ31 Magnesium Alloy" Materials 16, no. 3: 996. https://doi.org/10.3390/ma16030996