Titanium Grade 20, also known as Ti-6Al-7Nb, is a titanium alloy primarily composed of 6% aluminum and 7% niobium. This alloy is known for its excellent biocompatibility and corrosion resistance, specifically in physiological environments. Here are the key characteristics and typical applications of Grade 20 Titanium:

Ⅰ. Key Characteristics

① Composition: Alloyed with 6% aluminum and 7% niobium.

② Biocompatibility: Excellent biocompatibility, making it suitable for medical implants and surgical instruments.

③ Corrosion Resistance: High resistance to corrosion in physiological environments, including resistance to body fluids and tissues.

④ Strength: Moderate to high strength, comparable to commercially pure titanium grades.

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

② Dental: Used in dental implants and orthodontic devices where biocompatibility and strength are required.

③ Biomedical Devices: Utilized in biomedical devices and equipment requiring resistance to bodily fluids and tissues.

④ Aerospace: In specialized aerospace applications where biocompatibility and corrosion resistance properties are beneficial.

Ⅲ. Physical and Mechanical Properties

① Density: Approximately 4.5 g/cm³

② Tensile Strength: Typically around 860 MPa (125 ksi)

③ Yield Strength: Approximately 790 MPa (115 ksi)

④ Elongation: About 10-15% in 2 inches

⑤ Modulus of Elasticity: 105 GPa (15.2 Msi)

Titanium Grade 20 (Ti-6Al-7Nb) is a specialized titanium alloy primarily used in medical and dental applications where its biocompatibility and corrosion resistance properties are critical. Its use in these fields reflects its ability to withstand the harsh physiological environments of the human body while providing sufficient mechanical strength and durability.