Differences Between Ti-6Al-4V and Ti-6Al-4V ELI

Ti-6Al-4V and Ti-6Al-4V ELI are two common titanium alloys. Although these two titanium alloys are similar, there are differences between Ti-6Al-4V ELI (Grade 23) and Ti-6Al-4V (Grade 5), the main differences being in their impurity content, mechanical properties and application areas.

1. Purity and Impurity Content:

   • Ti-6Al-4V: This is the standard titanium alloy, containing 6% aluminum and 4% vanadium. It has a higher impurity content and is typically used in general industrial and aerospace applications.
   • Ti-6Al-4V ELI: ELI stands for "Extra Low Interstitial," meaning that this alloy has lower impurities such as oxygen, nitrogen, and carbon, resulting in higher purity. The reduced impurities enhance the material's toughness and fatigue resistance.

2. Mechanical Properties:

   • Ti-6Al-4V: It offers good strength, corrosion resistance, and fatigue resistance, and is widely used in aerospace, automotive, and other industrial fields.
   • Ti-6Al-4V ELI: Due to its lower impurity content, it has greater toughness and better performance at low temperatures, making it more suitable for critical biomedical applications, such as orthopedic implants, dental implants, and cardiac stents.

3. Application Fields:

   • Ti-6Al-4V: Primarily used in aerospace structures, turbine blades, and chemical processing equipment.
   • Ti-6Al-4V ELI: Mainly used for medical implants and surgical devices, particularly in applications requiring high biocompatibility and excellent performance in low-temperature environments.

In summary, Ti-6Al-4V ELI, with its higher purity and superior mechanical properties, is better suited for medical applications, while the standard Ti-6Al-4V is commonly used in industrial and aerospace fields.

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