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Ti-5Al-2.5Sn
Ti-5Al-2.5Sn is a medium-strength α-type single-phase titanium alloy, containing 5% α-stabilizing element aluminum and 2.5% neutral element tin. The alloy cannot be strengthened by heat treatment, and is usually used in an annealed state, and has good fracture toughness at room temperature and high temperature. Its process plasticity is low, and sheet forming should be carried out in a heated state, and it is characterized by better heat resistance strength. The alloy also has good welding performance and is suitable for welding processes of tungsten electrodes and metal electrodes under the protection of inert gas.
Ti-5Al-2.5Sn can be used to make parts such as casings and wall panels. The long-term working temperature of this alloy can reach 500℃, and the short-term working temperature can reach 800℃. The TA7ELI alloy with low interstitial impurity elements is suitable for use at low temperatures. The semi-finished products produced include plates, bars, cakes and ring parts, which can also be used to produce castings.
| Bending properties | |||||
| Form | δ/mm | State | Sampling direction | α(D=6d)/(º) | α(D=3δ)/(º) |
| Sheets | 0.8～2.0 | Annealing | LT | 20 | ≥50 |
Ti-5Al-2.5Sn chemical composition (mass fraction) %
| Grade | Alloy Element | Impurities≤ | |||||||||
| Ti | Al | Sn | Fe | Si | C | N | H | O | Other Element | ||
| Single | Total | ||||||||||
| Ti-5Al-2.5Sn | Balance | 4.0~6.0 | 2.0~3.0 | 0.5 | - | 0.1 | 0.05 | 0.015 | 0.2 | 0.1 | 0.4 |
Forms of Ti-5Al-2.5Sn We Can Provide
Physical and Chemical Properties of Ti-5Al-2.5Sn
1. Density ρ=4.42g/cm32. Melting temperature range: 1540~1650℃
3. Thermal conductivity
| Thermal conductivity | |||||||||
| θ/℃ | 20 | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| λ/W·m-1·K-1 | 8.8 | 9.6 | 10.9 | 12.2 | 13.4 | 14.7 | 15.9 | 17.2 | 18.4 |
4. Specific heat capacity
| Specific heat capacity | ||||||||
| θ/℃ | 100 | 200 | 300 | 400 | 500 | 600 | 700 | 800 |
| c/J·kg-1·K-1 | 503 | 545 | 566 | 587 | 628 | 670 | 712 | 796 |
5. Coefficient of linear expansion
| Coefficient of linear expansion | |||||||||
| θ/℃ | 20～100 | 20～200 | 20～300 | 20～400 | 20～500 | 20～600 | 20～700 | 20～800 | 20～900 |
| α/10-6·K-1 | 8.5 | 8.9 | 9.1 | 9.3 | 9.5 | 9.6 | 9.7 | 10.1 | 10.5 |
| θ/℃ | 100～200 | 200～300 | 300～400 | 400～500 | 500～600 | 600～700 |
| α/10-6·K-1 | 9.3 | 9.7 | 10 | 10.3 | 10.5 | 11 |
6. Electrical properties Resistivity
| Resistivity | |||||||
| θ/℃ | 20 | 100 | 200 | 300 | 400 | 500 | 600 |
| ρ/μΩ·m | 1.38 | 1.69 | 1.75 | 1.8 | 1.84 | 1.87 | 1.88 |
non-magnetic
8. Antioxidant properties
Similar to industrial pure titanium and Ti Gr5
9. Corrosion resistance
Ti-5Al-2.5Sn is stable under atmospheric conditions and in seawater. Compared with Ti Gr5, this alloy is more sensitive to hot salt stress corrosion. The alloy will produce stress corrosion when it is exposed to 316°C and 207MPa stress for 100h in an environment heavily covered by artificial sea salt.
Phase transformation and microstructure of Ti-5Al-2.5Sn
Phase transition temperature
The transformation temperature of β↔α+β phase is 1040~1090℃;
The transformation temperature of α↔α+β phase is 930~970℃
Microstructure
The equilibrium structure of the alloy below the α↔α+β transformation temperature (about 950°C) is single-phase α; when the alloy is rapidly cooled from the upper part of the α+β phase region (for example, 1010°C), α' and a small amount of α can be obtained phase; rapid cooling from the β phase region can obtain the α phase. During the annealing process, the α' phase gradually decomposes and transforms into the α phase.
Manufacturing process and properties of Ti-5Al-2.5Sn
Melting and casting process of Ti-5Al-2.5Sn
The ingot should be smelted in a vacuum consumable electric arc furnace for more than two times. Alloying elements Al and Sn are added in the form of Al-Sn intermediate. The welding of the consumable electrode adopts the argon shielded plasma welding method, and the use of argon tungsten arc welding is strictly prohibited.
Heat treatment system of Ti-5Al-2.5Sn
1) Annealing
Plate: 700~850℃, 10~120min, air cooling
Bars and forgings: 700~850℃, 1~4h, air cooling
2) Stress relief annealing
540~650℃, 15~360min, air cooling or furnace cooling.
Casting: 600~800℃, 1~4h, air cooling or furnace cooling.
Thermal deformation process
When the final fire deformation is carried out below the β transformation temperature, the deformation amount should be greater than 25%~40% to obtain good mechanical properties. If reheating is required in the future (such as thermal correction), it should be carried out at a temperature lower than 90 °C below the β transition temperature.
| Thermal deformation process specification of Ti-5Al-2.5Sn | |||
| Forging type | Heating temperature/℃ | Final forging temperature/℃ | First fire deformation/% |
| Ingot blooming | 1180 | ≥900 | 30～50 |
| Blank pre-deformation | 1100 | ≥850 | 40～70 |
| Forging hammer die forging | 1020～1100 | ≥900 | 40～70 |
| Press die forging | 1020 | ≥850 | 40～70 |
| Deformation resistance of Ti-5Al-2.5Sn under different deformation rates | ||||
| Deformation temperature | The maximum deformation resistance of the following deformation rate (s-1)/MPa | |||
| 10 | 10 | 1 | 10 | |
| 800 | 222 | 320 | 365 | 452 |
| 900 | 205 | 262 | 285 | 313 |
| 1000 | 80 | 93 | 105 | 117 |
| 1100 | 35 | 59 | 62 | 80 |
| Tensile properties of Ti-5Al-2.5Sn at heat distortion temperature | |||||||
| Form | d/mm | State | Sampling direction | θ/℃ | σb/MPa | δ5/% | ψ/% |
| Rods | 22 | Annealing | L | 700 | 252 | 86.2 | 82.2 |
| 800 | 160 | 140.8 | 95.6 | ||||
| 850 | 121 | 140 | 94 | ||||
| 900 | 88 | 170 | 96.5 | ||||
| 1000 | 35 | 78 | 63 | ||||
Application of Ti-5Al-2.5Sn
Using Titanium Grade 6 die forgings and ring parts made of engine adapter, front brake housing, sealing ring housing, as well as plate hot-press forming linings, bracket seats and wall panels and other parts have been used in the aviation industry. Because the alloy has excellent corrosion resistance, it is especially suitable for manufacturing ship parts.
