Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties
Abstract
:1. Introduction
2. Experimental
3. Results and Discussion
3.1. Initial Microstructure
3.2. Precipitation Behavior of the O Phase
3.3. Nucleation Mechanism of the O Phase
3.4. Tensile Properties
4. Conclusions
- (1)
- The acicular O phase precipitated from both the grain boundaries and the intragranular when aging at 900 °C. Increasing the temperature to 930 °C, the acicular O phase tends to precipitate from the grain boundaries. In addition, the average size of the O phase at 930 °C is larger than that at 900 °C. When aging at 950 °C, only a few globular O phases could be found at grain boundaries.
- (2)
- Under the condition of B2 slow cooling aging, there are two modes of nucleation mechanism of O phase from grain boundaries—sympathetic nucleation and interface instability nucleation.
- (3)
- With the increase of aging temperature, the volume fraction of the O phase decreased and the strength of the alloy increased. The strength of the alloy decreases with the increase of aging time when aging at 900 °C and 930 °C. When aging at 950 °C, strength experiences a first increase then decrease process. The reasonable match between strength could be obtained at 950 °C/1 h.
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Rolled Plate | Ti | Al | Nb | C | N | H | O |
---|---|---|---|---|---|---|---|
wt.% | Bal. | 10.11 | 41.25 | 0.0051 | 0.0031 | 0.002 | 0.0471 |
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Wei, B.; Tang, B.; Chen, X.; Xu, Q.; Zhang, S.; Kou, H.; Li, J. Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties. Metals 2020, 10, 1515. https://doi.org/10.3390/met10111515
Wei B, Tang B, Chen X, Xu Q, Zhang S, Kou H, Li J. Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties. Metals. 2020; 10(11):1515. https://doi.org/10.3390/met10111515
Chicago/Turabian StyleWei, Beibei, Bin Tang, Xiaofei Chen, Qin Xu, Shuaijin Zhang, Hongchao Kou, and Jinshan Li. 2020. "Precipitation Behavior of Orthorhombic Phase in Ti-22Al-25Nb Alloy during Slow Cooling Aging Treatment and Its Effect on Tensile Properties" Metals 10, no. 11: 1515. https://doi.org/10.3390/met10111515