Ti-7Al-4Mo
UNS R56740
Description
Ti-7Al-4Mo is an alpha-beta titanium alloy which contains 7% aluminum and 4% molybdenum with other trace amounts of alloying elements. The alloy is characterized by excellent creep resistance and high strength, and the creep resistance and strength are superior to Ti-6Al-4V. In addition, it shows very good high temperature resistance that can be used at temperatures up to 800 °F for long periods or 1300 °F for short periods. Ti-7Al-4Mo alloy can be hot or cold formed using power brake, hydropress, stretch or drop hammer methods.
Chemical Component
| Ti | Fe | O | C | N | H | Al | Mo | Y | Others |
|---|---|---|---|---|---|---|---|---|---|
| Balance | 0.3% max | 0.2% max | 0.1% max | 0.05% max | 0.013% max | 6.5-7.3% | 3.5-4.5% | 0.005% max | 0.1% max (each); 0.4% max (total) |
Basic Information
| Items | Ti-7Al-4Mo |
|---|---|
| Catalog | ACAM-Ti-A017 |
| Density | 0.162 lb/in3 (4.48 g/cm3) |
| Specific Heat Capacity | 0.123 Btu/lb.°F (515 J/kg) |
| Coefficient of Thermal Expansion | At RT to 850 °F: 5.4 x 10-6 /°F |
| Thermal Conductivity | 3.5 Btu/ft.h.°F (6.1 W/m.K) |
| Electrical Resistivity | 1.7 µΩ.m at 75 °F |
| Beta Transus | 1840 ± 25 °F (1005 ± 15 °C) |
| Melting Point | ≤3000 °F (≤1650 °C) |
Material Forms
Alfa Chemistry offers Ti-7Al-4Mo in a variety of forms, including Bar, Billet, Forgings and Extrusions.
Mechanical Properties
| Properties | Conditions | Size | Ultimate Tensile Strength | 0.2% Yield Strength | Elongation | Reduction of Area |
|---|---|---|---|---|---|---|
| Minimum tensile properties | STA forgings | <1" | 170 ksi (1172 Mpa) | 160 ksi (1103 Mpa) | 8% | 15% |
| Typical tensile properties | Forged annealed | <1" | 145 ksi (1000 Mpa) | 135 ksi (931 Mpa) | 10% | 20% |
Additional Properties
Machinability: Ti-7Al-4Mo alloy is hard to machine but can be successfully done using slow speeds, high coolant flow, and high feed rates.
Hot Working: Hot working enhances the overall ductility of the material.
Cold Working: Cold working features of this material is same as that of a moderately tempered austenitic stainless steel. Post-work annealing is recommended to re-attain favorable performance properties.
Specifications
Bar and Stock, Reforged: MIL-T-9047
Forgings: MIL-T-83142
Applications
Ti-7Al-4Mo can be used in a variety of applications, including:
- Structural components in aerospace
- Jet engine disks
- Compressor blades and spacers
- Sonic horns
* Technical data included herein should be used as a guideline only, and should not be construed as maximum or minimum values for specification or for final design, or for a particular use or application. The data may be revised anytime without notice.
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