Titanium Grade 22, also known as Ti-6Al-2Nb-1Ta-0.8Mo, is a titanium alloy known for its high strength, corrosion resistance, and biocompatibility. This alloy is primarily used in aerospace and medical applications where these properties are crucial. Here are the key characteristics and typical applications of Grade 22 Titanium:

Ⅰ. Key Characteristics

① Composition: Alloyed with 6% aluminum, 2% niobium, 1% tantalum, and 0.8% molybdenum.

② Strength: High tensile and yield strength, significantly stronger than commercially pure titanium grades.

③ Corrosion Resistance: Excellent resistance to corrosion in various environments, including seawater, acids, and physiological fluids, due to the addition of niobium, tantalum, and molybdenum.

④ Biocompatibility: Excellent biocompatibility, making it suitable for medical implants and surgical instruments.

⑤ Weldability: Good weldability, suitable for various fabrication processes.

⑥ Ductility: Good ductility, allowing for ease of forming and shaping.

⑦ Fatigue Resistance: Good fatigue resistance, suitable for implants subjected to cyclic loading.

Ⅱ. Typical Applications

① Aerospace: Used in aircraft components such as airframes, landing gear, and engine parts due to its high strength-to-weight ratio and corrosion resistance.

② Medical: Widely used in medical implants such as orthopedic implants (hip and knee replacements), dental implants, and surgical instruments due to its biocompatibility and corrosion resistance.

③ Dental: Used in dental implants and orthodontic devices where biocompatibility and strength are required.

④ Biomedical Devices: Utilized in biomedical devices and equipment requiring resistance to bodily fluids and tissues.

Ⅲ. Physical and Mechanical Properties

① Density: Approximately 4.5 g/cm³

② Tensile Strength: Typically around 1000 MPa (145 ksi)

③ Yield Strength: Approximately 900 MPa (130 ksi)

④ Elongation: About 10-15% in 2 inches

⑤ Modulus of Elasticity: 110 GPa (16 Msi)

Titanium Grade 22 (Ti-6Al-2Nb-1Ta-0.8Mo) is an advanced titanium alloy suited for demanding aerospace and medical applications where a combination of high strength, corrosion resistance, biocompatibility, and fatigue resistance is required. Its use is specialized and typically found in industries requiring high-performance materials capable of withstanding extreme conditions and physiological environments.