Effects of 3d Transition Metal Substitutions on the Phase Stability and Mechanical Properties of Ti–5.5Al–11.8[Mo]eq Alloys
Abstract
:1. Introduction
2. Experimental Section
2.1. Specimen Fabrications
2.2. Analysis
3. Results and Discussion
3.1. Workability
3.2. Phase Constitutions
3.3. Microstructures
3.4. Vickers Hardness
3.5. Tensile Tests
4. Conclusions
- Good workability, except for the Ti–Al–V alloy, was achieved in the Ti–Al–X (X = Cr, Co, and Ni) alloys.
- Via the phase identification by using X-ray measurements, the Ti–Al–V alloy showed a triple phase of β+α+Ti3Al, while other alloys were composed of the single parent β phase.
- In agreement with the phase identification, the microstructures also displayed a single β phase in the Ti–Al–X (X = Cr, Co, and Ni) alloys, while a multi-phase was found in the Ti–Al–V alloy.
- High Vickers hardness with a relatively large deviation was found in the triple-phase-composed Ti–Al–V alloy, while that of other alloys was comparatively low.
- Superelastic behavior at room temperature was successfully imposed on the Ti–5.5Al–9.5Ni alloy (mass%), which showed a shape recovery of about 3.6% and a superelastic recovery of 1.9%.
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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Ti–5.5Al–X Alloy | Mo [25] | (a) V | (b) Cr | (c) Co | (d) Ni |
---|---|---|---|---|---|
mass% X | 11.8 | 17.7 | 9.5 | 7.0 | 9.5 |
mol% X | 6.0 | 16.1 | 8.4 | 5.5 | 7.5 |
Alloy | Hot-Rolling (RH) | Cold-Rolling (RC) | Condition |
---|---|---|---|
(a) Ti–Al–V | 76% | × | Fractured |
(b) Ti–Al–Cr | 94% | 29% | Good |
(c) Ti–Al–Co | 91% | 52% | Good |
(d) Ti–Al–Ni | 91% | 34% | Partially cracked |
Alloy | Lattice Parameter, aβ (nm) | Standard Deviation |
---|---|---|
(a) Ti–Al–V | 0.3226 | 0.00579 |
(b) Ti–Al–Cr | 0.3234 | 0.00037 |
(c) Ti–Al–Co | 0.3233 | 0.00157 |
(d) Ti–Al–Ni | 0.3239 | 0.00087 |
(e) Ti–Al–Mo [25] | 0.3252 | 0.00087 |
(a) V | (b) Cr | (c) Co | (d) Ni | (e) Mo [25] | |
---|---|---|---|---|---|
0.2% stress, σy (MPa) | - | 675 | 661 | 420 | 372 |
UTS, σUTS (MPa) | - | 711 | 791 | 748 | 810 |
Fracture strain (%) | - | 2.6 | 3.3 | 4.1 | 9.5 |
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Nohira, N.; Widyanisa, K.; Chiu, W.-T.; Umise, A.; Tahara, M.; Hosoda, H. Effects of 3d Transition Metal Substitutions on the Phase Stability and Mechanical Properties of Ti–5.5Al–11.8[Mo]eq Alloys. Materials 2023, 16, 4526. https://doi.org/10.3390/ma16134526
Nohira N, Widyanisa K, Chiu W-T, Umise A, Tahara M, Hosoda H. Effects of 3d Transition Metal Substitutions on the Phase Stability and Mechanical Properties of Ti–5.5Al–11.8[Mo]eq Alloys. Materials. 2023; 16(13):4526. https://doi.org/10.3390/ma16134526
Chicago/Turabian StyleNohira, Naoki, Keiko Widyanisa, Wan-Ting Chiu, Akira Umise, Masaki Tahara, and Hideki Hosoda. 2023. "Effects of 3d Transition Metal Substitutions on the Phase Stability and Mechanical Properties of Ti–5.5Al–11.8[Mo]eq Alloys" Materials 16, no. 13: 4526. https://doi.org/10.3390/ma16134526