Effect of annealing temperature on La2O3 strengthened Mo–Re alloys
Molybdenum rhenium alloys are the solid solution strengthening alloys with high melting point and low expansion coefficient, and the addition of rare earth oxides can refine the grains and play a role in dispersion strengthening. Molybdenum−rhenium (Mo–Re) and molybdenum−rhenium−lanthanum (Mo–Re–La2...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | zho |
| Published: |
Editorial Office of Powder Metallurgy Technology
2025-02-01
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| Series: | Fenmo yejin jishu |
| Subjects: | |
| Online Access: | https://pmt.ustb.edu.cn/article/doi/10.19591/j.cnki.cn11-1974/tf.2023030007 |
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| Summary: | Molybdenum rhenium alloys are the solid solution strengthening alloys with high melting point and low expansion coefficient, and the addition of rare earth oxides can refine the grains and play a role in dispersion strengthening. Molybdenum−rhenium (Mo–Re) and molybdenum−rhenium−lanthanum (Mo–Re–La2O3) alloy plates were prepared by powder metallurgy and cross rolling method in this paper, and were annealed at different temperatures. The microstructure and room temperature tensile fracture morphology of the Mo–Re alloys and Mo–Re–La2O3 alloys annealed at different temperatures were observed by metallographic microscope and scanning electron microscope. The Vickers hardness and room temperature tensile properties of the two alloy plates were compared. The results show that the recrystallization temperature of Mo–Re alloys is about 1200 ℃, while that of the Mo–Re–La2O3 alloys is 1400 ℃. The addition of La2O3 increases the recrystallization temperature by about 200 ℃. With the increase of annealing temperature, the hardness and tensile strength of the Mo–Re alloys and Mo–Re–La2O3 alloys decrease significantly, while the elongation of Mo–Re–La2O3 alloys increases, up to 27.5%. |
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| ISSN: | 1001-3784 |