Effects of Element (Al, Mo, Sn and Fe) Doping on Phase Structure and Mechanical Properties of the Ti-Nb-Based Alloys
Abstract
:1. Introduction
2. Materials and Methods
3. Results and Discussion
3.1. The Phase Constitutions of Ti-Nb-Based Alloys
3.2. The Young’s Modulus and Yield Strength of the Ti-33Nb-2X (X = Al, Sn, Fe and Mo) Alloys
3.2.1. The Young’s Modulus, Yield Strength and the Superelastic Strain of the Water-Quenched Ti-33Nb-2X (X = Al, Sn, Fe and Mo) Alloys
3.2.2. The Young’s Modulus, Yield Strength and the Superelastic Strain of the Water-Quenched Ti-18Nb-5Mo and Ti-18Nb-5Mo-5Sn Alloys
4. Conclusions
- (1)
- Al increased the volume of the α′′ phase and reduce the volume of the βM phase in the water-quenched Ti-33Nb-2Al alloy.
- (2)
- The volume fraction of the β phase increased in the furnace-cooled Ti-33Nb-2Fe alloy when compared with the furnace-cooled Ti-33Nb alloys. Similarly, the volume of βM also increased in the water-quenched Ti-33Nb-2Fe alloy when compared with Ti-33Nb with the same heat treatment. Fe may form compounds under the condition of a low cooling rate to reduce the volume fraction of the β phase.
- (3)
- The β-stabilizing effect of Mo was present in both furnace-cooled and water-quenched Ti-33Nb-2Mo alloys.
- (4)
- Sn-doping played a complicated role to promote the formation of the α′′ phase in the water-quenched Ti-33Nb-2Sn alloys but increased the volume fraction of the β phase in the furnace-cooled Ti-33Nb-2Sn alloys and Ti-18Nb-5Mo-5Sn. Sn may impede β to ω phase transition and depresses the transition temperature of the β phase.
- (5)
- The water-quenched alloys with α′′ and βM phases possessed a better superelastic strain and smaller Young’s modulus. The water-quenched Ti-33Nb-2Sn possessed the least Young’s modulus and the largest superelastic strain and yield strength. For the present water-quenched Ti-based alloys, the Young’s modulus decreased and the superelastic strain was raised when increasing the volume of α′′.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Acknowledgments
Conflicts of Interest
References
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Nominal Chemical Compositions (wt.%) | Heat Treatments (950 °C, 30 min) | |
---|---|---|
Ti-18Nb-5Mo | Furnace-cooled | Water-quenched |
Ti-18Nb-5Mo-5Sn | ||
Ti-33Nb-2X (X = Al, Sn, Fe and Mo) |
Nominal Chemical Compositions (wt.%) | Young’s Modulus (GPa) |
---|---|
Ti-33Nb | 41.54 |
Ti-33Nb-2Mo | 54.32 |
Ti-33Nb-2Al | 46.25 |
Ti-33Nb-2Sn | 40.00 |
Ti-33Nb-2Fe | 48.24 |
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Gu, S.; Zhou, Z.; Min, N. Effects of Element (Al, Mo, Sn and Fe) Doping on Phase Structure and Mechanical Properties of the Ti-Nb-Based Alloys. Metals 2022, 12, 1249. https://doi.org/10.3390/met12081249
Gu S, Zhou Z, Min N. Effects of Element (Al, Mo, Sn and Fe) Doping on Phase Structure and Mechanical Properties of the Ti-Nb-Based Alloys. Metals. 2022; 12(8):1249. https://doi.org/10.3390/met12081249
Chicago/Turabian StyleGu, Suyi, Zhengcun Zhou, and Na Min. 2022. "Effects of Element (Al, Mo, Sn and Fe) Doping on Phase Structure and Mechanical Properties of the Ti-Nb-Based Alloys" Metals 12, no. 8: 1249. https://doi.org/10.3390/met12081249