Ti-2.5Cu
Description
Ti-2.5Cu titanium alloy, also known as Ti-230 titanium alloy, is a binary alloy with 2.5% copper added to improve mechanical properties (particularly at elevated temperatures (up to 662 °F)) compared to unalloyed titanium while maintaining the formability and weldability. Aged Ti-2.5Cu alloy is more creep-resistant than the hardest grade of commercially pure titanium at all temperatures. Since 1959, the alloy has been used in annealed condition as sheet, forgings and extrusions for fabricating components such as bypass ducts of gas-turbine engines. By the development of an ageing treatment, it also has been used in airframe industry. Ageing treatment can raise its room temperature tensile properties by ~25% and nearly double the elevated temperature properties.
Chemical Component
| Ti | Fe | O | N | C | H | Cu | Others |
|---|---|---|---|---|---|---|---|
| Balance | 0.20% max | 0.20% max | 0.03% max | 0.08% max | 0.01% max | 2.0-3.0% | 0.10% max (each); 0.40% max (total); |
Basic Information
| Items | Ti-2.5Cu |
|---|---|
| Catalog | ACAM-Ti-A004 |
| Density | 0.165 lb/in3 (4.56 g/cm3) |
| Mean Coefficient of Thermal Expansion | 5.0 x 10-6 in in-1 °F-1 (9.0 x 10-6 m m-1 °C-1) |
| Thermal Conductivity | 7.50 Btu hr-1 ft-1 °F-1 (12.97 W m-1K-1) |
| Electrical Resistivity | 26 µΩ·in (0.65 µΩ·m) |
| Beta Transus | 1640 °F (890 °C) |
| Magnetic Permeability | Nonmagnetic |
Material Forms
Alfa Chemistry offers Ti-2.5Cu in a variety of forms, including Forging Stock, Forgings, Extrusions, Plate, Sheet, Bars and Billets.
Mechanical Properties
| Properties | Conditions | Ultimate Tensile Strength | >0.2% Yield Strength | Elongation | Reduction of Area |
|---|---|---|---|---|---|
| Minimum tensile properties | - | 88 ksi (610 Mpa) | 71 ksi (490 Mpa) | 10% | 25% |
| Typical tensile properties | Sheet ST | 90 ksi (620 Mpa) | 77 ksi (530 Mpa) | 24% (on 50mm) | - |
| Sheet STA | 175-185 ksi (1207-1276 Mpa) | 96 ksi (660 Mpa) | 20% (on 50mm) | - | |
| Bar & Rod ST | 91 ksi (630 Mpa) | 72 ksi (500 Mpa) | 27% | 45% | |
| Bar & Rod STA | 107 ksi (740 Mpa) | 84 ksi (580 Mpa) | 22% | 41% | |
| Extrusions ST | 91 ksi (630 Mpa) | 72 ksi (500 Mpa) | 30% | 40% | |
| Extrusions STA | 115 ksi (790 Mpa) | 97 ksi (670 Mpa) | 28% | 30% |
Additional Properties
Forming: It is amenable to cold forming by conventional methods, such as pressing, stretch forming, spinning, etc., as applied to the stainless steels.
Welding: Ti-2.5Cu Alloy can be joined by fusion, resistance, flash-butt and pressure welding.
Heat Treatment: The full heat treatment consists of solution treatment at 805 ± 10 °C followed by a rapid cool and a duplex ageing process of 8-24 h at 400 °C and 8 h at 475 °C.
Applications
Ti-2.5Cu is used both in the airframe and in components such as bypass ducts for gas-turbine engines.
* 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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