Effects of an LPSO Phase Induced by Zn Addition on the High-Temperature Properties of Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy
Abstract
:1. Introduction
2. Experimental Materials and Methods
3. Results and Discussion
3.1. Microstructure of the Cast Alloys
3.2. Microstructure of the Solid Solution Alloys
3.3. Microstructure of the Aged Alloys
3.4. Effects of the LPSO Phase on the Tensile Properties of the Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy at High Temperature
3.5. Mechanism of Enhancing Plasticity by the LPSO Phase
3.6. Analysis of Microstructure and Morphology of the Alloy Side near a High-Temperature Tensile Fracture
4. Conclusions
- The cast alloy I mainly consisted of an α-Mg matrix and a Mg5RE phase. After adding Zn, the Mg5RE phase in the cast alloy transformed into a (Mg,Zn)3RE phase, and the morphology changed from an irregular strip to a semi-continuous network.
- After solid solution treatment, the secondary phase at the crystal boundaries of alloy I was almost completely dissolved in the matrix, while there were still residual secondary phases at the crystal boundaries of alloy II, and layer-like LPSO phases were generated under the interaction of Zn and the rare-earth elements.
- After the aging treatment, alloy I formed precipitates within the crystals, resulting in aging strengthening, and alloy II, due to the consumption of the RE elements by the LPSO phase, inevitably formed fewer precipitates, which weakened the strengthening effect.
- During the high-temperature tensile test, as the temperature gradually increased, the yield and tensile strength of alloy I decreased by 27 MPa and 74 MPa, respectively, and the elongation gradually increased to 9.1%. However, the decreasing trend for the tensile strength of alloy II significantly weakened, and the tensile strength decreased by 45 MPa. At the same time, the elongation was also higher than that of alloy I, increasing to 24.2%. This is mainly attributed to the ability of the LPSO phase to coordinate the stress and the activation of the pyramidal <c+a> slip under high-temperature conditions.
- In the high-temperature tensile structure, the side structure of alloy I softened, wrinkles increased, and there were microcracks perpendicular to the tensile direction, which became larger and more numerous with the increasing temperature. However, the softening degree of alloy II was not significant, and there were no significant wrinkles. Partial wrinkles and cracks only appeared when the temperature reached 250 °C.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Temperature (°C) | YS (MPa) | UTS (MPa) | EL (%) | |
---|---|---|---|---|
Mg-9Gd-2Nd- 0.5Zr(I) | 25 | 215.1 ± 5.1 | 308.7 ± 3.2 | 2.7 ± 0.1 |
200 | 213.7 ± 4.2 | 281.9 ± 2.5 | 7.8 ± 0.2 | |
225 | 203.1 ± 4.9 | 251.1 ± 2.7 | 8.6 ± 0.2 | |
250 | 187.2 ± 3.7 | 234.2 ± 2.4 | 9.1 ± 0.3 | |
Mg-9Gd-2Nd- 1.5Zn-0.5Zr(II) | 25 | 150.7 ± 5.6 | 243.3 ± 3.1 | 11.8 ± 0.4 |
200 | 153.7 ± 4.2 | 232.7 ± 2.9 | 15.1 ± 0.4 | |
225 | 146.1 ± 5.6 | 233.2 ± 3.3 | 20.1 ± 0.6 | |
250 | 122.1 ± 5.1 | 198.9 ± 3.0 | 24.2 ± 0.7 |
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Li, M.; Yao, M.; Liu, L.; Zhang, X.; Xing, Z.; Xia, X.; Liu, P.; Wan, Y.; Chen, Q.; Wang, H. Effects of an LPSO Phase Induced by Zn Addition on the High-Temperature Properties of Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy. Materials 2024, 17, 4075. https://doi.org/10.3390/ma17164075
Li M, Yao M, Liu L, Zhang X, Xing Z, Xia X, Liu P, Wan Y, Chen Q, Wang H. Effects of an LPSO Phase Induced by Zn Addition on the High-Temperature Properties of Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy. Materials. 2024; 17(16):4075. https://doi.org/10.3390/ma17164075
Chicago/Turabian StyleLi, Ming, Mengling Yao, Liangzhi Liu, Xiaoxia Zhang, Zhihui Xing, Xiangsheng Xia, Peng Liu, Yuanyuan Wan, Qiang Chen, and Hongxia Wang. 2024. "Effects of an LPSO Phase Induced by Zn Addition on the High-Temperature Properties of Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy" Materials 17, no. 16: 4075. https://doi.org/10.3390/ma17164075
APA StyleLi, M., Yao, M., Liu, L., Zhang, X., Xing, Z., Xia, X., Liu, P., Wan, Y., Chen, Q., & Wang, H. (2024). Effects of an LPSO Phase Induced by Zn Addition on the High-Temperature Properties of Mg-9Gd-2Nd-(1.5Zn)-0.5Zr Alloy. Materials, 17(16), 4075. https://doi.org/10.3390/ma17164075