Alloy Overview
Ti – 8Al – 1Mo – 1V alloy (UNS R54810) is a near – alpha titanium alloy. Aluminum acts as the alpha stabilizer, while additions of Mo, V, and Fe introduce small amounts of beta phase. It’s mainly designed for elevated – temperature applications, boasting good creep strength, excellent weldability, and the lowest density among titanium – base alloys.
Application Scenarios
- Aerospace Industry: Widely applied in aircraft engine components like forged compressor blades and disks, thanks to its high strength, superior creep resistance up to 450°C, and favorable stiffness – to – density ratio. Also used in airframe parts where toughness is required.
- Available Forms: Offered as wire (for welding), bar, billet, sheet, plate, extrusions, and forgings.
Technical Specifications
1. Beta Transus Temperature
1,900°F (1,038°C)
2. Chemistry Requirements (wt%)
| Element | Content |
| N | 0.05 |
| C | 0.08 |
| H | 0.0125 |
| Fe | 0.3 |
| O | 0.15 |
| Al | 7.35 – 8.35 |
| V | 0.75 – 1.25 |
| Mo | 0.75 – 1.25 |
| Ti | Balance |
Tensile Properties
| Condition | UTS ksi (Mpa) | >0.2%YS ksi (MPA) | % El. | % RA* |
| Minimum Tensile Properties | ||||
| Annealed | 130 (895) | 120 (828) | 10 | 20 |
| Heat Treated | 170 (1180) | 155 (1070) | 10 | 20 |
| Heat Treated at 800°F | 90 (620) | 70 (480) | 10 | 25 |
| Typical Tensile Properties | ||||
| Annealed | 148 (1021) | 134 (924) | 19 | 40 |
Principal Design Features
- Precipitation Hardening: One of the most commonly used precipitation – hardening grades. In the solution – annealed state, it’s soft and ductile, and can achieve high properties through a single precipitation or aging treatment.
- Corrosion Resistance & Mechanical Traits: Exhibits good corrosion resistance, high hardness, toughness, and strength.
- High Tensile Modulus to Density Ratio: Offers an advantage over most commercial titanium alloys, making it suitable for high – performance aerospace applications.
Machinability
- Chip Characteristics: Produces long, gummy chips during machining.
- Optimal Machining Condition: Can be machined in the annealed condition, but condition H1150M yields the best results. If machining in this condition, post – machining solution treatment is needed before final hardening.
Welding
- Welding Methods: Can be successfully welded using common fusion and resistance methods. Avoid oxy – acetylene welding. AWS E/ER630 filler metal is recommended if necessary. Inert gas shielded fusion and resistance – welding processes are suitable.
- Stress Relief Caution: Subsequent stress relief annealing should avoid the 1,000 – 1,200°F (538 – 649°C) temperature range to prevent loss of fracture toughness.
Forging
- Pre – forging Soaking: Soak for 1 hour at 2150°F (1177°C) before forging.
- Working Temperature: Do not work below 1850°F (1010°C).
- Post – forging Treatment: Post – work solution treatment is required before