The Polythermal Section of Ti-22Al-xNb (30-78at.%Ti) in Ti–Al–Nb System
Abstract
:1. Introduction
2. Materials and Method
3. Results
3.1. Analysis of DSC Results
3.2. Analysis of Typical Alloys in Polythermal Section
3.3. Polythermal Section
4. Discussion
5. Conclusions
Author Contributions
Funding
Conflicts of Interest
References
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Phase | Pearson Symbol | Space Group | Strukturbericht Designation | Prototype |
---|---|---|---|---|
(Al)(αAl), fcc_Al | cF4 | Fm-3m | A1 | Cu |
α, (αTi), hcp_A3 | hp2 | P63/mmc | A3 | Mg |
α2, Ti3Al | hP8 | P63/mmc | D019 | Ni3Sn |
β, (βTi), bcc_A2 | cI2 | Im-3m | A2 | W |
β0, bcc_B2 | cI2 | Pm-3m | B2 | CsCl |
γ, γTiAl, TiAl | tP4 | P4/mmm | L10 | AuCu |
δ, Nb3Al | cP8 | Pm-3n | A15 | Cr3Si |
ℇ, (Ti1−xNbx)Al3, TiAl3(h), NbAl3 | tI8 | I4/mmm | D022 | TiAl3(h) |
ε(l), TiAl3(l) | tI32 | I4/mmm | — | TiAl3(l) |
ζ, Ti2+xAl5−x | tP28 | P4/mmm | — | Ti2Al5 |
η, TiAl2 | tI24 | I41/amd | — | HfGa2 |
σ, Nb2Al | tP30 | P42/mnm | D8b | σCrFe |
Ti3Al5 | tP32 | P4/mbm | — | Ti3Al5 |
O1, O, O1(h), Ti2NbAl | oC16 | Cmcm | — | NaHg |
O2, O2(r), Ti2NbAl | oC16 | Cmcm | — | NaHg |
τ, Ti4NbAl3 | hP6 | P63/mmc | B82 | Ni2In |
γ1-Ti4Nb3Al9 | tP16 | P4/mmm | — | γ1-Ti4Nb3Al9 |
No. | Alloy Compositions | ||
---|---|---|---|
Ti | Al | Nb | |
1 | 73 | 22 | 5 |
2 | 68 | 22 | 10 |
3 | 63 | 22 | 15 |
4 | 58 | 22 | 20 |
5 | 53 | 22 | 25 |
6 | 48 | 22 | 30 |
7 | 43 | 22 | 35 |
8 | 38 | 22 | 40 |
9 | 33 | 22 | 45 |
No. | Heat Treatment | Phase Constitution | Phase Composition, at.% | Phase Fraction | |||||
---|---|---|---|---|---|---|---|---|---|
Phase 1/2/3 | Phase 1 | Phase 2 | Phase 3 | Phase1:2:3 | |||||
Al | Ti | Al | Ti | Al | Ti | ||||
1 | 1000 °C 720 h | β/α2 | 16.7 | 75.9 | 23.7 | 74.3 | - | - | 0.53:0.47 |
900 °C 1440 h | α2 | 21.6 | 73.7 | - | - | - | - | 1 | |
800 °C 2160 h | α2 | 21.6 | 75.8 | - | - | - | - | 1 | |
2 | 1000 °C 720 h | β/α2 | 18.4 | 68.3 | 23.3 | 68.3 | - | - | 0.58:0.42 |
900 °C 1440 h | β/α2 | 14.3 | 67.9 | 23.4 | 67.9 | - | - | 0.59:0.41 | |
800 °C 2160 h | α2/O | 22.5 | 68.9 | 18.0 | 68.9 | - | - | 0.42:0.58 | |
3 | 1000 °C 720 h | β/α2 | 20.4 | 61.9 | 24.6 | 65.3 | - | - | 0.60:0.40 |
900 °C 1440 h | β/α2 | 15.7 | 61.3 | 23.4 | 64.7 | - | - | 0.62:0.38 | |
800 °C 2160 h | α2/O | 22.7 | 64.9 | 15.3 | 61.2 | - | - | 0.43:0.57 | |
4 | 1000 °C 720 h | β/α2 | 20.5 | 53.5 | 24.5 | 61.2 | - | - | 0.63:0.37 |
900 °C 1440 h | β/α2/O | 15.6 | 56.8 | 23.5 | 62.9 | 23.5 | 60.0 | 0.6:0.03:0.37 | |
800 °C 2160 h | β/α2/O | 18.3 | 52.1 | 23.0 | 59.4 | 13.0 | 56.0 | 0.58:0.02:0.4 | |
5 | 1000 °C 720 h | β | 22.5 | 53.2 | - | - | - | - | 1 |
900 °C 1440 h | β/O | 23.9 | 53.9 | 15.7 | 52.3 | - | - | 0.57:0.43 | |
800 °C 2160 h | β/O | 23.9 | 54.5 | 19.4 | 52.8 | - | - | 0.6:0.4 | |
6 | 1000 °C 720 h | β/σ | 22.3 | 47.0 | 26.8 | 57.8 | - | - | 0.64:0.36 |
900 °C 1440 h | β/O | 23.1 | 50.0 | 15.2 | 47.0 | - | - | 0.55:0.45 | |
800 °C 2160 h | β/O | 24.8 | 49.5 | 18.6 | 46.7 | - | - | 0.61:0.39 | |
7 | 1000 °C 720 h | β/σ | 21.5 | 44.8 | 27.2 | 56.8 | - | - | 0.67:0.33 |
900 °C 1440h | β/O/δ | 23.3 | 52.1 | 14.6 | 47.7 | 19.7 | 33.4 | 0.04:0.4:0.56 | |
800 °C 2160 h | β/O | 22.6 | 45.1 | 17.7 | 42.1 | - | - | 0.58:0.42 | |
8 | 1000 °C 720 h | β/σ/δ | 19.5 | 46.7 | 25.0 | 59.1 | 20.4 | 31.0 | 0.11:0.37:0.52 |
900 °C 1440 h | β/O/δ | 14.7 | 46.9 | 23.6 | 52.8 | 20.1 | 34.5 | 0.02:0.41:0.57 | |
800 °C 2160 h | β/O/δ | 23.7 | 35.3 | 24.8 | 42.5 | 21.8 | 29.3 | 0.01:0.41:0.58 | |
9 | 1000 °C 720 h | β/σ/δ | 19.3 | 42.4 | 22.6 | 54.3 | 19.6 | 30.3 | 0.52:0.09:0.39 |
900 °C 1440 h | O/δ | 22.8 | 50.1 | 20.3 | 32.5 | - | - | 0.41:0.59 | |
800 °C 2160 h | O/δ | 25.8 | 43.3 | 19.3 | 33.2 | - | - | 0.40:0.60 |
No. | Composition | Crucible Type | Mass (mg) | Rate (°C/min) | Phase Transformation | Temperature (°C) |
---|---|---|---|---|---|---|
1 | Ti74.8Al21.6Nb3.6 | Al2O3 | 13.56 | 20 | α2 ↔ α2 + β | 950(±10) |
α2 + β ↔ β | 1110(±10) | |||||
2 | Ti68.3Al22.2Nb9.5 | Al2O3 | 17.75 | 20 | α2 ↔α2 + β | 821(±10) |
α2 + β ↔ β | 1112(±10) | |||||
3 | Ti63.2Al22Nb14.8 | Al2O3 | 14.45 | 20 | O + α2 ↔α2 + β+ O | 748(±10) |
α2 + β + O ↔ α2 + β | 882(±10) | |||||
α2 + β ↔ β | 1060(±10) | |||||
4 | Ti56.4Al22Nb21.6 | Al2O3 | 18.73 | 20 | β + O ↔ α2 + β + O | 821(±10) |
α2 + β + O ↔ α2 + β | 932(±10) | |||||
α2 + β ↔ β | 976(±10) | |||||
5 | Ti53.2Al22.5Nb24.3 | Al2O3 | 26.67 | 20 | β + O ↔ β | 966(±10) |
6 | Ti47.8Al22.4Nb29.8 | Al2O3 | 22.23 | 20 | β + O + δ ↔ β + O + σ | 931(±10) |
β + O + σ ↔ β + σ | 978(±10) | |||||
β + σ ↔ β | - | |||||
7 | Ti45.5Al21.4Nb33.1 | Pt | 14.78 | 20 | β + O ↔ β + O + δ | 878(±3) |
β + O + δ ↔ β + O + σ | 931(±3) | |||||
β + O + σ ↔ β + σ | 986(±3) | |||||
β + σ ↔ β | - | |||||
8 | Ti39.7Al21.2Nb39.1 | Pt | 15.67 | 20 | Β +O + δ ↔ δ + β + σ | 931(±3) |
δ + β + σ ↔ β + σ | 969(±3) | |||||
β + σ ↔ β | 1151(±3) | |||||
9 | Ti33.9Al21.1Nb45 | Al2O3 | 11.96 | 20 | O + δ ↔ β + O + δ | 873(±10) |
β + O + δ ↔ δ + β + σ | 931(±10) | |||||
δ + β + σ ↔ β + σ | 1191(±10) | |||||
β + σ ↔ β | 1273(±10) |
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Zhao, Y.; Liu, L.-B.; Zhang, L.-G.; Yang, J.-J.; Masset, P.J. The Polythermal Section of Ti-22Al-xNb (30-78at.%Ti) in Ti–Al–Nb System. Metals 2020, 10, 871. https://doi.org/10.3390/met10070871
Zhao Y, Liu L-B, Zhang L-G, Yang J-J, Masset PJ. The Polythermal Section of Ti-22Al-xNb (30-78at.%Ti) in Ti–Al–Nb System. Metals. 2020; 10(7):871. https://doi.org/10.3390/met10070871
Chicago/Turabian StyleZhao, Yun, Li-Bin Liu, Li-Gang Zhang, Jia-Jun Yang, and Patrick J. Masset. 2020. "The Polythermal Section of Ti-22Al-xNb (30-78at.%Ti) in Ti–Al–Nb System" Metals 10, no. 7: 871. https://doi.org/10.3390/met10070871