（TA12）Ti-5.5Al-4Sn-2Zr-1Mo-0.25Si-1Nd Temperature Titanium Alloy

High-Temperature Titanium Alloy Ti-5.5Al-4Sn-2Zr-1Mo-0.25Si-1Nd (Chinese Designation: TA12)

The Ti-5.5Al-4Sn-2Zr-1Mo-0.25Si-1Nd titanium alloy is a near-alpha (near-α) titanium alloy with excellent overall properties, reinforced with the rare earth metal Nd (Neodymium).

Chinese standard designation: TA12

This alloy can operate at temperatures up to 550°C for extended periods and is used in high-pressure components of aircraft engines, such as compressor disks, drums, and blades.

It has good workability, is suitable for various pressure forming and mechanical processing methods, and is mainly produced as bars, forgings, and sheets, while also being used for casting applications.

Chemical Composition (%):

• Mo (Molybdenum): 0.75~1.25%

• Al (Aluminum): 4.8~6.0%

• Sn (Tin): 3.7~4.7%

• Zr (Zirconium): 1.5~2.5%

• Si (Silicon): 0.20~0.35%

• Nd (Neodymium): 0.6~1.2%

• Ti (Titanium): Balance

• Fe (Iron): ≤ 0.25%

• C (Carbon): ≤ 0.08%

• N (Nitrogen): ≤ 0.05%

• H (Hydrogen): ≤ 0.012%

• O (Oxygen): ≤ 0.15%

Alloy Properties

• Density at room temperature: 4.56 g/cm³

• Elastic modulus: 119 GPa

• Hardness: 305~316 HB

• Phase transformation temperature: 1005°C ± 10°C

Standards and Designations

• Chinese standard (GB/T3620.1-2016): TA12

• Chemical composition conforms to GB/T3620.1

• International equivalents:

• Russia: ВТ25 (VT25)

• United States: No direct equivalent

• Europe: No direct equivalent

High-Temperature Properties

• Creep resistance: Excellent creep resistance at 450°C~550°C, making it ideal for long-term service.

• Oxidation resistance: The combination of Aluminum (Al) and Tin (Sn) enhances oxidation resistance, maintaining stability at high temperatures.

• Structural stability: Even after long-term high-temperature exposure, the alloy structure remains stable and does not undergo significant phase transformations that could lead to performance degradation.

Main Applications

The TA12 alloy is used in conditions requiring high-temperature resistance, corrosion resistance, and high strength. It is particularly in demand in the aerospace and military industries.

(1) Aerospace Industry

• Aircraft engine components (compressor blades, turbine disks, etc.)

• Structural components of aircraft (heat-resistant sections of the fuselage)

• Nozzles and rocket engine components

(2) Military Equipment

• High-temperature structural components for hypersonic vehicles

• High-temperature parts for missile engines

(3) Other High-Temperature Applications

• High-temperature piping for nuclear power plants

• Heat-resistant fasteners for electronic devices

Heat Treatment and Processing

(1) Heat Treatment Process

To improve the comprehensive performance of the TA12 alloy, a solution treatment + aging treatment process is generally used.

• Solution treatment:

• 950°C~1000°C, air cooling or water quenching

• Aging treatment:

• 550°C~600°C, holding for 4~8 hours, air cooling

(2) Processing Characteristics

• Weldability: Good, but inert gas (such as argon) protection is required to prevent contamination and embrittlement.

• Machinability: Suitable for various machining methods.

• Formability: Can undergo hot rolling, forging, and stamping, but deformation temperature must be controlled to maintain structural stability.

Pricing and Production Standards

Pricing depends on specifications, quantity, and delivery time.

Production follows the Chinese GB/T3620.1 standard, with the possibility of compliance with other standards upon request.

Contact Information

• Email: genieoffice.cn@gmail.com