Grade 5 Titanium (Ti-6Al-4V)—designated as TC4 in China—is currently one of the most widely used titanium alloys. Classified as an α+β type titanium alloy, it is composed primarily of titanium (Ti), aluminum (Al), and vanadium (V), with aluminum acting as the α-phase stabilizer and vanadium as the β-phase stabilizer.
Due to its high specific strength, excellent corrosion resistance, good fatigue performance, and favorable high-temperature stability, Grade 5 titanium alloy is widely utilized in sectors such as aerospace, medical implants, energy, marine engineering, automotive manufacturing, and high-end machinery production.
Grade 5 is one of the most mature and widely used titanium alloys in global industry. Key performance characteristics include:
1. High Strength and High Specific Strength: The primary advantages of Ti-6Al-4V are its high strength and low weight. Typical properties include a density of approximately 4.43 g/cm³, tensile strength of 895–1000 MPa, yield strength of 825–900 MPa, and elongation exceeding 10%. Compared to steel, Grade 5 titanium alloy is approximately 40% lighter while maintaining high mechanical strength, making it particularly suitable for applications requiring significant weight reduction.
2. Excellent Corrosion Resistance: A stable, dense oxide film forms on the surface of the alloy, providing superior corrosion resistance. It withstands environments such as seawater, chloride media, various acidic and alkaline conditions, and corrosive chemical agents, leading to its widespread use in marine engineering and chemical processing equipment.
3. Good Fatigue Performance:
Grade 5 titanium alloy possesses high fatigue strength and can withstand long-term cyclic loading. Applications include aircraft structural components, engine parts, and high-speed rotating components.
4. Excellent Biocompatibility: Ti-6Al-4V exhibits good compatibility with human tissue and is unlikely to trigger rejection reactions. Primary applications include orthopedic implants, artificial joints, dental implants, and medical devices. The medical sector typically utilizes the Extra Low Interstitial (ELI) variant: Ti-6Al-4V ELI (Grade 23).
5. Good heat resistance: Grade 5 titanium alloy is suitable for long-term use at temperatures ranging from approximately 300°C to 400°C, maintaining good strength in medium-temperature environments.
Thanks to a combination of advantages—including high strength, low density, corrosion resistance, and excellent biocompatibility—Grade 5 titanium (Ti-6Al-4V) has become one of the most important titanium alloys in modern industry.
From aerospace structural components to medical implants, and from marine engineering to high-end manufacturing, Grade 5 titanium alloy—backed by mature production processes and stable performance—continues to drive the development of lightweight, highly reliable materials.
