The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment
Abstract
:1. Introduction
2. Materials and Experimental Methods
3. Results
3.1. Microstructure Analysis
3.2. Hardness
4. Discussion
4.1. Different Forms of Second Phase
4.2. LPSO Structure
4.3. Formation of 14H-LPSO
5. Conclusions
- (1)
- When the solution temperature was 490 °C, a large number of lamellar LPSO phases were formed in the alloy, and the grain size increased. The number of lamellar phases was greatly reduced, and the grain size was almost unchanged when the solution temperature was raised to 500 °C.
- (2)
- After 490 °C × 13 h solution treatment, the average hardness of the alloy was the highest, which is due to the great contribution of the lamellar structure. After 500 °C × 13 h solution treatment, although the hardness decreases slightly, the grain size of the alloy decreases, the volume fraction of the second phase is the least, and the solid solution degree of the alloy is sufficient. Therefore, 500 °C × 13 h is comprehensively considered is the best solution treatment process.
- (3)
- After 490 °C × 13 h solution treatment, the lamellar phase was 14H-LPSO phase according to the diffraction pattern analysis. Through the analysis of the volume fraction of the second phase and the lattice constant, it was proven that Gd and Y elements were derived from the Mg matrix, and then, the LPSO phase was formed.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Mg | Gd | Y | Zn | Zr |
---|---|---|---|---|
Bal | 9.2 | 1.9 | 1.8 | 0.5 |
Sample | Block Phase | Rod Phase | Lamellar Phase | Rare Earth-Rich Phase | The Total |
---|---|---|---|---|---|
460 °C × 13 h | 12.67 | 22.93 | 0.00 | 0.58 | 36.18 |
470 °C × 13 h | 9.30 | 14.76 | 0.00 | 0.84 | 24.90 |
480 °C × 13 h | 9.83 | 4.81 | 0.00 | 0.97 | 15.61 |
490 °C × 13 h | 8.93 | 0.00 | 11.32 | 0.68 | 20.93 |
500 °C × 13 h | 13.35 | 0.00 | 1.23 | 0.79 | 15.37 |
(hkl) | 460 °C × 13 h | 470 °C × 13 h | 480 °C × 13 h | 490 °C × 13 h | 500 °C × 13 h | |||||
---|---|---|---|---|---|---|---|---|---|---|
2θ | d | 2θ | d | 2θ | d | 2θ | d | 2θ | d | |
(100) | 32.166 | 2.7806 | 32.216 | 2.7763 | 32.253 | 2.7816 | 32.359 | 2.7644 | 32.145 | 2.7823 |
(002) | 34.421 | 2.6034 | 34.419 | 2.6035 | 34.333 | 2.6098 | 34.479 | 2.5991 | 34.373 | 2.6069 |
(101) | 36.577 | 2.4547 | 36.593 | 2.4537 | 36.593 | 2.4537 | 36.632 | 2.4511 | 36.529 | 2.4579 |
(102) | 47.871 | 1.8987 | 47.795 | 1.9015 | 47.778 | 1.9021 | 48.017 | 1.8932 | 47.791 | 1.9016 |
(110) | 57.428 | 1.6033 | 57.409 | 1.6038 | 57.387 | 1.6044 | 57.367 | 1.6049 | 57.293 | 1.6068 |
(103) | 63.159 | 1.4709 | 63.043 | 1.4734 | 63.022 | 1.4738 | 63.211 | 1.4698 | 63.003 | 1.4742 |
(200) | 67.359 | 1.3891 | 67.343 | 1.3893 | 67.324 | 1.3897 | ||||
(112) | 68.780 | 1.3638 | 68.524 | 1.3683 | 68.540 | 1.3680 | 68.802 | 1.3634 | 68.596 | 1.3670 |
(201) | 70.048 | 1.3422 | 69.859 | 1.3453 | 69.882 | 1.3450 | 69.973 | 1.3434 | 69.740 | 1.3473 |
(004) | 72.468 | 1.3032 | 72.735 | 1.2991 | 72.392 | 1.3044 | 72.328 | 1.3054 |
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Liu, Y.; Yang, Y.; Yi, M.; Yu, J.; Li, B.; Zhang, Z. The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment. Materials 2021, 14, 5758. https://doi.org/10.3390/ma14195758
Liu Y, Yang Y, Yi M, Yu J, Li B, Zhang Z. The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment. Materials. 2021; 14(19):5758. https://doi.org/10.3390/ma14195758
Chicago/Turabian StyleLiu, Yunfang, Yaqin Yang, Ming Yi, Jianmin Yu, Baocheng Li, and Zhimin Zhang. 2021. "The Formation of 14H-LPSO in Mg–9Gd–2Y–2Zn–0.5Zr Alloy during Heat Treatment" Materials 14, no. 19: 5758. https://doi.org/10.3390/ma14195758